1219820912640 has 720 divisors, whose sum is σ = 4773120715440. Its totient is φ = 295572602880.

The previous prime is 1219820912599. The next prime is 1219820912659. The reversal of 1219820912640 is 462190289121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 583924716 + ... + 583926804.

It is an arithmetic number, because the mean of its divisors is an integer number (6629334327).

Almost surely, 2^{1219820912640} is an apocalyptic number.

1219820912640 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 1219820912640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386560357720).

1219820912640 is an abundant number, since it is smaller than the sum of its proper divisors (3553299802800).

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

1219820912640 is an frugal number, since it uses more digits than its factorization.

1219820912640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151 (or 2110 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 1219820912640 in words is "one trillion, two hundred nineteen billion, eight hundred twenty million, nine hundred twelve thousand, six hundred forty".