399871908 has 18 divisors (see below), whose sum is σ = 1010787414. Its totient is φ = 133290624.

The previous prime is 399871889. The next prime is 399871919. The reversal of 399871908 is 809178993.

It can be written as a sum of positive squares in only one way, i.e., 399680064 + 191844 = 19992^2 + 438^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 5553741 + ... + 5553812.

Almost surely, 2^399871908 is an apocalyptic number.

It is an amenable number.

399871908 is an abundant number, since it is smaller than the sum of its proper divisors (610915506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399871908 is a wasteful number, since it uses less digits than its factorization.

399871908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11107563 (or 11107558 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 399871908 is about 19996.7974435908. The cubic root of 399871908 is about 736.7276421709.

The spelling of 399871908 in words is "three hundred ninety-nine million, eight hundred seventy-one thousand, nine hundred eight".