399784964 has 6 divisors (see below), whose sum is σ = 699623694. Its totient is φ = 199892480.

The previous prime is 399784939. The next prime is 399784969. The reversal of 399784964 is 469487993.

It can be written as a sum of positive squares in only one way, i.e., 398800900 + 984064 = 19970^2 + 992^2 .

It is not an unprimeable number, because it can be changed into a prime (399784969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49973117 + ... + 49973124.

It is an arithmetic number, because the mean of its divisors is an integer number (116603949).

Almost surely, 2^399784964 is an apocalyptic number.

It is an amenable number.

399784964 is a deficient number, since it is larger than the sum of its proper divisors (299838730).

399784964 is a wasteful number, since it uses less digits than its factorization.

399784964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99946245 (or 99946243 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 59.

The square root of 399784964 is about 19994.6233772982. The cubic root of 399784964 is about 736.6742428282.

The spelling of 399784964 in words is "three hundred ninety-nine million, seven hundred eighty-four thousand, nine hundred sixty-four".