390749994 has 20 divisors (see below), whose sum is σ = 875569794. Its totient is φ = 130249944.

The previous prime is 390749993. The next prime is 390749999. The reversal of 390749994 is 499947093.

It can be written as a sum of positive squares in only one way, i.e., 272745225 + 118004769 = 16515^2 + 10863^2 .

It is a super-2 number, since 2×390749994² = 305371115622000072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 390749994.

It is not an unprimeable number, because it can be changed into a prime (390749993) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1205857 + ... + 1206180.

Almost surely, 2^390749994 is an apocalyptic number.

390749994 is an abundant number, since it is smaller than the sum of its proper divisors (484819800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390749994 is a wasteful number, since it uses less digits than its factorization.

390749994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412051 (or 2412042 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 390749994 is about 19767.3972490057. The cubic root of 390749994 is about 731.0823963019.

The spelling of 390749994 in words is "three hundred ninety million, seven hundred forty-nine thousand, nine hundred ninety-four".