257447985 has 32 divisors (see below), whose sum is σ = 418099968. Its totient is φ = 135260160.

The previous prime is 257447941. The next prime is 257447987. The reversal of 257447985 is 589744752.

It is a happy number.

It is not a de Polignac number, because 257447985 - 2¹⁰ = 257446961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257447987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433849 + ... + 434441.

It is an arithmetic number, because the mean of its divisors is an integer number (13065624).

Almost surely, 2^257447985 is an apocalyptic number.

It is an amenable number.

257447985 is a deficient number, since it is larger than the sum of its proper divisors (160651983).

257447985 is a wasteful number, since it uses less digits than its factorization.

257447985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 985.

The product of its digits is 2822400, while the sum is 51.

The square root of 257447985 is about 16045.1857265661. The cubic root of 257447985 is about 636.1553233037.

The spelling of 257447985 in words is "two hundred fifty-seven million, four hundred forty-seven thousand, nine hundred eighty-five".