390433994 has 4 divisors (see below), whose sum is σ = 585650994. Its totient is φ = 195216996.

The previous prime is 390433961. The next prime is 390434069. The reversal of 390433994 is 499334093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499334093 = 29 ⋅17218417.

It can be written as a sum of positive squares in only one way, i.e., 289170025 + 101263969 = 17005^2 + 10063^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97608497 + ... + 97608500.

Almost surely, 2^390433994 is an apocalyptic number.

390433994 is a deficient number, since it is larger than the sum of its proper divisors (195217000).

390433994 is a wasteful number, since it uses less digits than its factorization.

390433994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195216999.

The product of its (nonzero) digits is 314928, while the sum is 44.

The square root of 390433994 is about 19759.4026731579. The cubic root of 390433994 is about 730.8852674090.

The spelling of 390433994 in words is "three hundred ninety million, four hundred thirty-three thousand, nine hundred ninety-four".