257421153 has 16 divisors (see below), whose sum is σ = 376531200. Its totient is φ = 155137680.

The previous prime is 257421133. The next prime is 257421163. The reversal of 257421153 is 351124752.

It is not a de Polignac number, because 257421153 - 2⁹ = 257420641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257421153.

It is not an unprimeable number, because it can be changed into a prime (257421133) 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 15 ways as a sum of consecutive naturals, for example, 15883 + ... + 27696.

It is an arithmetic number, because the mean of its divisors is an integer number (23533200).

Almost surely, 2^257421153 is an apocalyptic number.

It is an amenable number.

257421153 is a deficient number, since it is larger than the sum of its proper divisors (119110047).

257421153 is a wasteful number, since it uses less digits than its factorization.

257421153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43772.

The product of its digits is 8400, while the sum is 30.

The square root of 257421153 is about 16044.3495661245. The cubic root of 257421153 is about 636.1332218648.

The spelling of 257421153 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, one hundred fifty-three".