257123399 has 8 divisors (see below), whose sum is σ = 277440912. Its totient is φ = 236882880.

The previous prime is 257123389. The next prime is 257123401. The reversal of 257123399 is 993321752.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257123399 - 2²⁰ = 256074823 is a prime.

It is a super-2 number, since 2×257123399² = 132224884626626402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257123389) 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, 12209 + ... + 25754.

It is an arithmetic number, because the mean of its divisors is an integer number (34680114).

Almost surely, 2^257123399 is an apocalyptic number.

257123399 is a deficient number, since it is larger than the sum of its proper divisors (20317513).

257123399 is a wasteful number, since it uses less digits than its factorization.

257123399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38497.

The product of its digits is 102060, while the sum is 41.

The square root of 257123399 is about 16035.0677890678. The cubic root of 257123399 is about 635.8878596306.

The spelling of 257123399 in words is "two hundred fifty-seven million, one hundred twenty-three thousand, three hundred ninety-nine".