391296871 has 8 divisors (see below), whose sum is σ = 473502240. Its totient is φ = 315667968.

The previous prime is 391296859. The next prime is 391296877. The reversal of 391296871 is 178692193.

It is a happy number.

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

It is not a de Polignac number, because 391296871 - 2⁵ = 391296839 is a prime.

It is a super-2 number, since 2×391296871² = 306226482508781282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391296877) 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, 1643986 + ... + 1644223.

It is an arithmetic number, because the mean of its divisors is an integer number (59187780).

Almost surely, 2^391296871 is an apocalyptic number.

391296871 is a deficient number, since it is larger than the sum of its proper divisors (82205369).

391296871 is a wasteful number, since it uses less digits than its factorization.

391296871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3288233.

The product of its digits is 163296, while the sum is 46.

The square root of 391296871 is about 19781.2252148344. The cubic root of 391296871 is about 731.4233012101.

The spelling of 391296871 in words is "three hundred ninety-one million, two hundred ninety-six thousand, eight hundred seventy-one".