399878144 has 24 divisors (see below), whose sum is σ = 799565130. Its totient is φ = 199938048.

The previous prime is 399878099. The next prime is 399878179. The reversal of 399878144 is 441878993.

It can be written as a sum of positive squares in only one way, i.e., 362521600 + 37356544 = 19040^2 + 6112^2 .

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95579 + ... + 99674.

Almost surely, 2^399878144 is an apocalyptic number.

It is an amenable number.

399878144 is a deficient number, since it is larger than the sum of its proper divisors (399686986).

399878144 is an equidigital number, since it uses as much as digits as its factorization.

399878144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195275 (or 195255 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 399878144 is about 19996.9533679508. The cubic root of 399878144 is about 736.7314719053.

The spelling of 399878144 in words is "three hundred ninety-nine million, eight hundred seventy-eight thousand, one hundred forty-four".