1209204080640 has 504 divisors, whose sum is σ = 4352846766408. Its totient is φ = 322327019520.

The previous prime is 1209204080639. The next prime is 1209204080641. The reversal of 1209204080640 is 460804029021.

1209204080640 is a `hidden beast` number, since 1 + 2 + 0 + 9 + 2 + 0 + 4 + 0 + 8 + 0 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (1209204080639) and next prime (1209204080641).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1209204080595 and 1209204080604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209204080641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 477756175 + ... + 477758705.

It is an arithmetic number, because the mean of its divisors is an integer number (8636600727).

Almost surely, 2^{1209204080640} is an apocalyptic number.

1209204080640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1209204080640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176423383204).

1209204080640 is an abundant number, since it is smaller than the sum of its proper divisors (3143642685768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1209204080640 is an frugal number, since it uses more digits than its factorization.

1209204080640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 1209204080640 in words is "one trillion, two hundred nine billion, two hundred four million, eighty thousand, six hundred forty".