12640396 has 24 divisors (see below), whose sum is σ = 23688000. Its totient is φ = 5883984.

The previous prime is 12640393. The next prime is 12640399. The reversal of 12640396 is 69304621.

It is an interprime number because it is at equal distance from previous prime (12640393) and next prime (12640399).

It is a super-2 number, since 2×12640396² = 319559222073632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12640393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3075 + ... + 5893.

It is an arithmetic number, because the mean of its divisors is an integer number (987000).

Almost surely, 2^12640396 is an apocalyptic number.

It is an amenable number.

12640396 is a deficient number, since it is larger than the sum of its proper divisors (11047604).

12640396 is a wasteful number, since it uses less digits than its factorization.

12640396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901 (or 2899 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 12640396 is about 3555.3334583411. Note that the first 3 decimals coincide. The cubic root of 12640396 is about 232.9450895060.

The spelling of 12640396 in words is "twelve million, six hundred forty thousand, three hundred ninety-six".