399984988 has 12 divisors (see below), whose sum is σ = 753817960. Its totient is φ = 184608432.

The previous prime is 399984967. The next prime is 399984989. The reversal of 399984988 is 889489993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399984989) 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 3 ways as a sum of consecutive naturals, for example, 3845958 + ... + 3846061.

Almost surely, 2^399984988 is an apocalyptic number.

It is an amenable number.

399984988 is a deficient number, since it is larger than the sum of its proper divisors (353832972).

399984988 is a wasteful number, since it uses less digits than its factorization.

399984988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692036 (or 7692034 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 67.

The square root of 399984988 is about 19999.6246964787. The cubic root of 399984988 is about 736.7970821660.

The spelling of 399984988 in words is "three hundred ninety-nine million, nine hundred eighty-four thousand, nine hundred eighty-eight".