257442337 has 4 divisors (see below), whose sum is σ = 264400276. Its totient is φ = 250484400.

The previous prime is 257442329. The next prime is 257442371. The reversal of 257442337 is 733244752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194017041 + 63425296 = 13929^2 + 7964^2 .

It is a cyclic number.

It is not a de Polignac number, because 257442337 - 2³ = 257442329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 6957901 = 257442337 / (2 + 5 + 7 + 4 + 4 + 2 + 3 + 3 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257442296 and 257442305.

It is not an unprimeable number, because it can be changed into a prime (257442307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478914 + ... + 3478987.

It is an arithmetic number, because the mean of its divisors is an integer number (66100069).

Almost surely, 2^257442337 is an apocalyptic number.

It is an amenable number.

257442337 is a deficient number, since it is larger than the sum of its proper divisors (6957939).

257442337 is an equidigital number, since it uses as much as digits as its factorization.

257442337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6957938.

The product of its digits is 141120, while the sum is 37.

The square root of 257442337 is about 16045.0097226521. The cubic root of 257442337 is about 636.1506711904.

The spelling of 257442337 in words is "two hundred fifty-seven million, four hundred forty-two thousand, three hundred thirty-seven".