399954788 has 18 divisors (see below), whose sum is σ = 738700326. Its totient is φ = 189451584.

The previous prime is 399954781. The next prime is 399954803. The reversal of 399954788 is 887459993.

It can be written as a sum of positive squares in only one way, i.e., 396487744 + 3467044 = 19912^2 + 1862^2 .

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 399954788.

It is not an unprimeable number, because it can be changed into a prime (399954781) 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 5 ways as a sum of consecutive naturals, for example, 137045 + ... + 139932.

It is an arithmetic number, because the mean of its divisors is an integer number (41038907).

Almost surely, 2^399954788 is an apocalyptic number.

399954788 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

399954788 is a deficient number, since it is larger than the sum of its proper divisors (338745538).

399954788 is a wasteful number, since it uses less digits than its factorization.

399954788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277019 (or 276998 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 62.

The square root of 399954788 is about 19998.8696680587. The cubic root of 399954788 is about 736.7785382767.

The spelling of 399954788 in words is "three hundred ninety-nine million, nine hundred fifty-four thousand, seven hundred eighty-eight".