1200999980 has 24 divisors (see below), whose sum is σ = 2531216688. Its totient is φ = 478663488.

The previous prime is 1200999967. The next prime is 1201000007. The reversal of 1200999980 is 899990021.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102854 + ... + 113933.

It is an arithmetic number, because the mean of its divisors is an integer number (105467362).

Almost surely, 2^1200999980 is an apocalyptic number.

1200999980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200999980 is an abundant number, since it is smaller than the sum of its proper divisors (1330216708).

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

1200999980 is a wasteful number, since it uses less digits than its factorization.

1200999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217073 (or 217071 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 1200999980 is about 34655.4466137720. The cubic root of 1200999980 is about 1062.9536642608.

The spelling of 1200999980 in words is "one billion, two hundred million, nine hundred ninety-nine thousand, nine hundred eighty".