390403994 has 8 divisors (see below), whose sum is σ = 586690068. Its totient is φ = 194840640.

The previous prime is 390403967. The next prime is 390403999. The reversal of 390403994 is 499304093.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 339922969 + 50481025 = 18437^2 + 7105^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (390403999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179327 + ... + 181490.

Almost surely, 2^390403994 is an apocalyptic number.

390403994 is a deficient number, since it is larger than the sum of its proper divisors (196286074).

390403994 is a wasteful number, since it uses less digits than its factorization.

390403994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361360.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 390403994 is about 19758.6435263153. The cubic root of 390403994 is about 730.8665471131.

It can be divided in two parts, 39040 and 3994, that added together give a palindrome (43034).

The spelling of 390403994 in words is "three hundred ninety million, four hundred three thousand, nine hundred ninety-four".