257257427 has 4 divisors (see below), whose sum is σ = 294008496. Its totient is φ = 220506360.

The previous prime is 257257381. The next prime is 257257453. The reversal of 257257427 is 724752752.

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

It is a cyclic number.

It is not a de Polignac number, because 257257427 - 2¹⁴ = 257241043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257257457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18375524 + ... + 18375537.

It is an arithmetic number, because the mean of its divisors is an integer number (73502124).

Almost surely, 2^257257427 is an apocalyptic number.

257257427 is a deficient number, since it is larger than the sum of its proper divisors (36751069).

257257427 is an equidigital number, since it uses as much as digits as its factorization.

257257427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36751068.

The product of its digits is 274400, while the sum is 41.

The square root of 257257427 is about 16039.2464598559. The cubic root of 257257427 is about 635.9983279560.

The spelling of 257257427 in words is "two hundred fifty-seven million, two hundred fifty-seven thousand, four hundred twenty-seven".