399609406 has 128 divisors (see below), whose sum is σ = 811008000. Its totient is φ = 146694240.

The previous prime is 399609401. The next prime is 399609407. The reversal of 399609406 is 604906993.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399609401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9293221 + ... + 9293263.

It is an arithmetic number, because the mean of its divisors is an integer number (6336000).

Almost surely, 2^399609406 is an apocalyptic number.

399609406 is an abundant number, since it is smaller than the sum of its proper divisors (411398594).

399609406 is a wasteful number, since it uses less digits than its factorization.

399609406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 399609406 is about 19990.2327650280. The cubic root of 399609406 is about 736.5663948568.

The spelling of 399609406 in words is "three hundred ninety-nine million, six hundred nine thousand, four hundred six".