399149768 has 8 divisors (see below), whose sum is σ = 748405830. Its totient is φ = 199574880.

The previous prime is 399149767. The next prime is 399149771. The reversal of 399149768 is 867941993.

It can be written as a sum of positive squares in only one way, i.e., 247810564 + 151339204 = 15742^2 + 12302^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (399149761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24946853 + ... + 24946868.

Almost surely, 2^399149768 is an apocalyptic number.

It is an amenable number.

399149768 is a deficient number, since it is larger than the sum of its proper divisors (349256062).

399149768 is a wasteful number, since it uses less digits than its factorization.

399149768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49893727 (or 49893723 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 56.

The square root of 399149768 is about 19978.7328927537. The cubic root of 399149768 is about 736.2838824950.

The spelling of 399149768 in words is "three hundred ninety-nine million, one hundred forty-nine thousand, seven hundred sixty-eight".