391379431 has 8 divisors (see below), whose sum is σ = 408895200. Its totient is φ = 373905312.

The previous prime is 391379413. The next prime is 391379449. The reversal of 391379431 is 134973193.

It is an interprime number because it is at equal distance from previous prime (391379413) and next prime (391379449).

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 391379431 - 2¹⁷ = 391248359 is a prime.

It is a super-2 number, since 2×391379431² = 306355718019767522, 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 (391379411) 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, 9645 + ... + 29593.

It is an arithmetic number, because the mean of its divisors is an integer number (51111900).

Almost surely, 2^391379431 is an apocalyptic number.

391379431 is a deficient number, since it is larger than the sum of its proper divisors (17515769).

391379431 is a wasteful number, since it uses less digits than its factorization.

391379431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20825.

The product of its digits is 61236, while the sum is 40.

The square root of 391379431 is about 19783.3119320300. The cubic root of 391379431 is about 731.4747387637.

The spelling of 391379431 in words is "three hundred ninety-one million, three hundred seventy-nine thousand, four hundred thirty-one".