12649257 has 8 divisors (see below), whose sum is σ = 18739680. Its totient is φ = 8432820.

The previous prime is 12649253. The next prime is 12649261. The reversal of 12649257 is 75294621.

12649257 is a `hidden beast` number, since 1 + 2 + 649 + 2 + 5 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (12649253) and next prime (12649261).

It is not a de Polignac number, because 12649257 - 2² = 12649253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12649253) 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, 234219 + ... + 234272.

It is an arithmetic number, because the mean of its divisors is an integer number (2342460).

Almost surely, 2^12649257 is an apocalyptic number.

It is an amenable number.

12649257 is a deficient number, since it is larger than the sum of its proper divisors (6090423).

12649257 is an equidigital number, since it uses as much as digits as its factorization.

12649257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468500 (or 468494 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 12649257 is about 3556.5793959927. The cubic root of 12649257 is about 232.9995088006. Note that the first 3 decimals are identical.

The spelling of 12649257 in words is "twelve million, six hundred forty-nine thousand, two hundred fifty-seven".