399478036 has 24 divisors (see below), whose sum is σ = 749589120. Its totient is φ = 185607552.

The previous prime is 399478033. The next prime is 399478039. The reversal of 399478036 is 630874993.

It is an interprime number because it is at equal distance from previous prime (399478033) and next prime (399478039).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399478031) 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, 31810 + ... + 42553.

It is an arithmetic number, because the mean of its divisors is an integer number (31232880).

Almost surely, 2^399478036 is an apocalyptic number.

It is an amenable number.

399478036 is a deficient number, since it is larger than the sum of its proper divisors (350111084).

399478036 is a wasteful number, since it uses less digits than its factorization.

399478036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74463 (or 74461 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 49.

The square root of 399478036 is about 19986.9466402450. The cubic root of 399478036 is about 736.4856715878.

The spelling of 399478036 in words is "three hundred ninety-nine million, four hundred seventy-eight thousand, thirty-six".