12638902 has 4 divisors (see below), whose sum is σ = 18958356. Its totient is φ = 6319450.

The previous prime is 12638897. The next prime is 12638903. The reversal of 12638902 is 20983621.

12638902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20983621 = 31 ⋅676891.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3159724 + ... + 3159727.

It is an arithmetic number, because the mean of its divisors is an integer number (4739589).

Almost surely, 2^12638902 is an apocalyptic number.

12638902 is a deficient number, since it is larger than the sum of its proper divisors (6319454).

12638902 is an equidigital number, since it uses as much as digits as its factorization.

12638902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319453.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 12638902 is about 3555.1233452582. The cubic root of 12638902 is about 232.9359116902.

The spelling of 12638902 in words is "twelve million, six hundred thirty-eight thousand, nine hundred two".