253904397 has 16 divisors (see below), whose sum is σ = 354257280. Its totient is φ = 161583552.

The previous prime is 253904377. The next prime is 253904407. The reversal of 253904397 is 793409352.

It is not a de Polignac number, because 253904397 - 2⁷ = 253904269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253904327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15697 + ... + 27462.

It is an arithmetic number, because the mean of its divisors is an integer number (22141080).

Almost surely, 2^253904397 is an apocalyptic number.

It is an amenable number.

253904397 is a deficient number, since it is larger than the sum of its proper divisors (100352883).

253904397 is a wasteful number, since it uses less digits than its factorization.

253904397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43252.

The product of its (nonzero) digits is 204120, while the sum is 42.

The square root of 253904397 is about 15934.3778353596. The cubic root of 253904397 is about 633.2230869659.

The spelling of 253904397 in words is "two hundred fifty-three million, nine hundred four thousand, three hundred ninety-seven".