257825947 has 4 divisors (see below), whose sum is σ = 259794216. Its totient is φ = 255857680.

The previous prime is 257825923. The next prime is 257825951. The reversal of 257825947 is 749528752.

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 257825947 - 2⁷ = 257825819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257825947.

It is not an unprimeable number, because it can be changed into a prime (257825987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983938 + ... + 984199.

It is an arithmetic number, because the mean of its divisors is an integer number (64948554).

Almost surely, 2^257825947 is an apocalyptic number.

257825947 is a deficient number, since it is larger than the sum of its proper divisors (1968269).

257825947 is a wasteful number, since it uses less digits than its factorization.

257825947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968268.

The product of its digits is 1411200, while the sum is 49.

The square root of 257825947 is about 16056.9594568835. The cubic root of 257825947 is about 636.4664864419.

The spelling of 257825947 in words is "two hundred fifty-seven million, eight hundred twenty-five thousand, nine hundred forty-seven".