399954807 has 64 divisors (see below), whose sum is σ = 727680000. Its totient is φ = 216421632.

The previous prime is 399954803. The next prime is 399954823. The reversal of 399954807 is 708459993.

399954807 is a `hidden beast` number, since 3 + 9 + 99 + 548 + 0 + 7 = 666.

It is not a de Polignac number, because 399954807 - 2² = 399954803 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399954803) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 174823 + ... + 177095.

It is an arithmetic number, because the mean of its divisors is an integer number (11370000).

Almost surely, 2^399954807 is an apocalyptic number.

399954807 is a deficient number, since it is larger than the sum of its proper divisors (327725193).

399954807 is a wasteful number, since it uses less digits than its factorization.

399954807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 399954807 is about 19998.8701430856. The cubic root of 399954807 is about 736.7785499437.

The spelling of 399954807 in words is "three hundred ninety-nine million, nine hundred fifty-four thousand, eight hundred seven".