12699920 has 20 divisors (see below), whose sum is σ = 29527500. Its totient is φ = 5079936.

The previous prime is 12699899. The next prime is 12699931. The reversal of 12699920 is 2999621.

It can be written as a sum of positive squares in 2 ways, for example, as 1597696 + 11102224 = 1264^2 + 3332^2 .

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

It is a super-2 number, since 2×12699920² = 322575936012800, which contains 22 as substring.

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, 79295 + ... + 79454.

It is an arithmetic number, because the mean of its divisors is an integer number (1476375).

Almost surely, 2^12699920 is an apocalyptic number.

12699920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12699920 is an abundant number, since it is smaller than the sum of its proper divisors (16827580).

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

12699920 is a wasteful number, since it uses less digits than its factorization.

12699920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158762 (or 158756 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 12699920 is about 3563.6947119528. The cubic root of 12699920 is about 233.3101655002.

The spelling of 12699920 in words is "twelve million, six hundred ninety-nine thousand, nine hundred twenty".