399604973 has 4 divisors (see below), whose sum is σ = 412495488. Its totient is φ = 386714460.

The previous prime is 399604963. The next prime is 399604981. The reversal of 399604973 is 379406993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 399604973 - 2²² = 395410669 is a prime.

It is a super-3 number, since 3×399604973³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399604943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6445211 + ... + 6445272.

It is an arithmetic number, because the mean of its divisors is an integer number (103123872).

Almost surely, 2^399604973 is an apocalyptic number.

It is an amenable number.

399604973 is a deficient number, since it is larger than the sum of its proper divisors (12890515).

399604973 is a wasteful number, since it uses less digits than its factorization.

399604973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890514.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 399604973 is about 19990.1218855714. The cubic root of 399604973 is about 736.5636711881.

The spelling of 399604973 in words is "three hundred ninety-nine million, six hundred four thousand, nine hundred seventy-three".