12638475 has 18 divisors (see below), whose sum is σ = 22637316. Its totient is φ = 6740400.

The previous prime is 12638471. The next prime is 12638491. The reversal of 12638475 is 57483621.

12638475 is a `hidden beast` number, since 12 + 638 + 4 + 7 + 5 = 666.

It is not a de Polignac number, because 12638475 - 2² = 12638471 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12638471) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 27861 + ... + 28310.

Almost surely, 2^12638475 is an apocalyptic number.

12638475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12638475 is a deficient number, since it is larger than the sum of its proper divisors (9998841).

12638475 is a wasteful number, since it uses less digits than its factorization.

12638475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56187 (or 56179 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 12638475 is about 3555.0632905759. The cubic root of 12638475 is about 232.9332884467.

The spelling of 12638475 in words is "twelve million, six hundred thirty-eight thousand, four hundred seventy-five".