856991374 has 8 divisors (see below), whose sum is σ = 1285641000. Its totient is φ = 428444376.

The previous prime is 856991357. The next prime is 856991381. The reversal of 856991374 is 473199658.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×856991374² = 1468868430220815752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592 + ... + 41404.

It is an arithmetic number, because the mean of its divisors is an integer number (160705125).

Almost surely, 2^856991374 is an apocalyptic number.

856991374 is a deficient number, since it is larger than the sum of its proper divisors (428649626).

856991374 is a wasteful number, since it uses less digits than its factorization.

856991374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51314.

The product of its digits is 1632960, while the sum is 52.

The square root of 856991374 is about 29274.4150069647. The cubic root of 856991374 is about 949.8582887420.

The spelling of 856991374 in words is "eight hundred fifty-six million, nine hundred ninety-one thousand, three hundred seventy-four".