856993293 has 24 divisors (see below), whose sum is σ = 1334092032. Its totient is φ = 526988448.

The previous prime is 856993261. The next prime is 856993321. The reversal of 856993293 is 392399658.

It is not a de Polignac number, because 856993293 - 2⁵ = 856993261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856993393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281980 + ... + 285002.

It is an arithmetic number, because the mean of its divisors is an integer number (55587168).

Almost surely, 2^856993293 is an apocalyptic number.

It is an amenable number.

856993293 is a deficient number, since it is larger than the sum of its proper divisors (477098739).

856993293 is a wasteful number, since it uses less digits than its factorization.

856993293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465 (or 5462 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 54.

The square root of 856993293 is about 29274.4477830069. The cubic root of 856993293 is about 949.8589977249.

The spelling of 856993293 in words is "eight hundred fifty-six million, nine hundred ninety-three thousand, two hundred ninety-three".