390193731 has 12 divisors (see below), whose sum is σ = 568785360. Its totient is φ = 257742000.

The previous prime is 390193717. The next prime is 390193733. The reversal of 390193731 is 137391093.

It is not a de Polignac number, because 390193731 - 2¹⁵ = 390160963 is a prime.

It is a super-2 number, since 2×390193731² = 304502295423400722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (390193733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197895 + ... + 199856.

It is an arithmetic number, because the mean of its divisors is an integer number (47398780).

Almost surely, 2^390193731 is an apocalyptic number.

390193731 is a deficient number, since it is larger than the sum of its proper divisors (178591629).

390193731 is a wasteful number, since it uses less digits than its factorization.

390193731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397866 (or 397863 counting only the distinct ones).

The product of its (nonzero) digits is 15309, while the sum is 36.

The square root of 390193731 is about 19753.3220244090. The cubic root of 390193731 is about 730.7353140042.

The spelling of 390193731 in words is "three hundred ninety million, one hundred ninety-three thousand, seven hundred thirty-one".