257421972 has 12 divisors (see below), whose sum is σ = 600651296. Its totient is φ = 85807320.

The previous prime is 257421959. The next prime is 257421977. The reversal of 257421972 is 279124752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 257421972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257421977) 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, 10725904 + ... + 10725927.

Almost surely, 2^257421972 is an apocalyptic number.

It is an amenable number.

257421972 is an abundant number, since it is smaller than the sum of its proper divisors (343229324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257421972 is a wasteful number, since it uses less digits than its factorization.

257421972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21451838 (or 21451836 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 257421972 is about 16044.3750891083. The cubic root of 257421972 is about 636.1338964954.

The spelling of 257421972 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, nine hundred seventy-two".