257400997 has 4 divisors (see below), whose sum is σ = 294172576. Its totient is φ = 220629420.

The previous prime is 257400977. The next prime is 257401003. The reversal of 257400997 is 799004752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 257400997 - 2¹⁹ = 256876709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257400917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18385779 + ... + 18385792.

It is an arithmetic number, because the mean of its divisors is an integer number (73543144).

Almost surely, 2^257400997 is an apocalyptic number.

It is an amenable number.

257400997 is a deficient number, since it is larger than the sum of its proper divisors (36771579).

257400997 is an equidigital number, since it uses as much as digits as its factorization.

257400997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36771578.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 257400997 is about 16043.7214199200. The cubic root of 257400997 is about 636.1166184172.

The spelling of 257400997 in words is "two hundred fifty-seven million, four hundred thousand, nine hundred ninety-seven".