864425257 has 4 divisors (see below), whose sum is σ = 864537856. Its totient is φ = 864312660.

The previous prime is 864425239. The next prime is 864425267. The reversal of 864425257 is 752524468.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 864425257 - 2¹⁹ = 863900969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864425267) 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 3 ways as a sum of consecutive naturals, for example, 43869 + ... + 60442.

It is an arithmetic number, because the mean of its divisors is an integer number (216134464).

Almost surely, 2^864425257 is an apocalyptic number.

It is an amenable number.

864425257 is a deficient number, since it is larger than the sum of its proper divisors (112599).

864425257 is a wasteful number, since it uses less digits than its factorization.

864425257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112598.

The product of its digits is 537600, while the sum is 43.

The square root of 864425257 is about 29401.1097919789. The cubic root of 864425257 is about 952.5968679139.

The spelling of 864425257 in words is "eight hundred sixty-four million, four hundred twenty-five thousand, two hundred fifty-seven".