390890690 has 16 divisors (see below), whose sum is σ = 744991992. Its totient is φ = 147158784.

The previous prime is 390890653. The next prime is 390890693. The reversal of 390890690 is 96098093.

It can be written as a sum of positive squares in 4 ways, for example, as 376321201 + 14569489 = 19399^2 + 3817^2 .

It is a super-2 number, since 2×390890690² = 305591063057352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (390890693) 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, 1149509 + ... + 1149848.

Almost surely, 2^390890690 is an apocalyptic number.

390890690 is a deficient number, since it is larger than the sum of its proper divisors (354101302).

390890690 is a wasteful number, since it uses less digits than its factorization.

390890690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299381.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 390890690 is about 19770.9557179212. The cubic root of 390890690 is about 731.1701318765.

The spelling of 390890690 in words is "three hundred ninety million, eight hundred ninety thousand, six hundred ninety".