1200687920 has 20 divisors (see below), whose sum is σ = 2791599600. Its totient is φ = 480275136.

The previous prime is 1200687913. The next prime is 1200687931. The reversal of 1200687920 is 297860021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7504220 + ... + 7504379.

It is an arithmetic number, because the mean of its divisors is an integer number (139579980).

Almost surely, 2^1200687920 is an apocalyptic number.

1200687920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200687920 is an abundant number, since it is smaller than the sum of its proper divisors (1590911680).

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

1200687920 is a wasteful number, since it uses less digits than its factorization.

1200687920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15008612 (or 15008606 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1200687920 is about 34650.9439986849. The cubic root of 1200687920 is about 1062.8615926373.

The spelling of 1200687920 in words is "one billion, two hundred million, six hundred eighty-seven thousand, nine hundred twenty".