1209997310400 has 504 divisors, whose sum is σ = 4499529709584. Its totient is φ = 319798886400.

The previous prime is 1209997310363. The next prime is 1209997310413. The reversal of 1209997310400 is 40137999021.

1209997310400 is a `hidden beast` number, since 1 + 209 + 9 + 9 + 7 + 31 + 0 + 400 = 666.

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 71 ways as a sum of consecutive naturals, for example, 43920630 + ... + 43948170.

Almost surely, 2^{1209997310400} is an apocalyptic number.

1209997310400 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 1209997310400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249764854792).

1209997310400 is an abundant number, since it is smaller than the sum of its proper divisors (3289532399184).

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

1209997310400 is a wasteful number, since it uses less digits than its factorization.

1209997310400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27691 (or 27664 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 1209997310400 in words is "one trillion, two hundred nine billion, nine hundred ninety-seven million, three hundred ten thousand, four hundred".