390491031 has 16 divisors (see below), whose sum is σ = 595380224. Its totient is φ = 223007904.

The previous prime is 390491009. The next prime is 390491047. The reversal of 390491031 is 130194093.

It is not a de Polignac number, because 390491031 - 2¹⁰ = 390490007 is a prime.

It is a super-2 number, since 2×390491031² = 304966490582885922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 390491031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390491051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40665 + ... + 49341.

It is an arithmetic number, because the mean of its divisors is an integer number (37211264).

Almost surely, 2^390491031 is an apocalyptic number.

390491031 is a deficient number, since it is larger than the sum of its proper divisors (204889193).

390491031 is a wasteful number, since it uses less digits than its factorization.

390491031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10830.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 390491031 is about 19760.8459080071. The cubic root of 390491031 is about 730.9208564149.

The spelling of 390491031 in words is "three hundred ninety million, four hundred ninety-one thousand, thirty-one".