856475957 has 4 divisors (see below), whose sum is σ = 857906400. Its totient is φ = 855045516.

The previous prime is 856475933. The next prime is 856475959. The reversal of 856475957 is 759574658.

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, and also an emirpimes, since its reverse is a distinct semiprime: 759574658 = 2 ⋅379787329.

It is a cyclic number.

It is not a de Polignac number, because 856475957 - 2¹⁰ = 856474933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856475959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714323 + ... + 715520.

It is an arithmetic number, because the mean of its divisors is an integer number (214476600).

Almost surely, 2^856475957 is an apocalyptic number.

It is an amenable number.

856475957 is a deficient number, since it is larger than the sum of its proper divisors (1430443).

856475957 is a wasteful number, since it uses less digits than its factorization.

856475957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430442.

The product of its digits is 10584000, while the sum is 56.

The square root of 856475957 is about 29265.6104839793. The cubic root of 856475957 is about 949.6678273579.

The spelling of 856475957 in words is "eight hundred fifty-six million, four hundred seventy-five thousand, nine hundred fifty-seven".