851974987 has 8 divisors (see below), whose sum is σ = 875713952. Its totient is φ = 828273600.

The previous prime is 851974979. The next prime is 851974999. The reversal of 851974987 is 789479158.

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

It is a cyclic number.

It is not a de Polignac number, because 851974987 - 2³ = 851974979 is a prime.

It is a super-2 number, since 2×851974987² = 1451722756947300338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851974967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40162 + ... + 57592.

It is an arithmetic number, because the mean of its divisors is an integer number (109464244).

Almost surely, 2^851974987 is an apocalyptic number.

851974987 is a deficient number, since it is larger than the sum of its proper divisors (23738965).

851974987 is a wasteful number, since it uses less digits than its factorization.

851974987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18789.

The product of its digits is 5080320, while the sum is 58.

The square root of 851974987 is about 29188.6105698781. The cubic root of 851974987 is about 948.0013333997.

The spelling of 851974987 in words is "eight hundred fifty-one million, nine hundred seventy-four thousand, nine hundred eighty-seven".