399753897 has 24 divisors (see below), whose sum is σ = 553760352. Its totient is φ = 256501440.

The previous prime is 399753889. The next prime is 399753911. The reversal of 399753897 is 798357993.

It is not a de Polignac number, because 399753897 - 2³ = 399753889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399753897.

It is not an unprimeable number, because it can be changed into a prime (399753817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 902158 + ... + 902600.

It is an arithmetic number, because the mean of its divisors is an integer number (23073348).

Almost surely, 2^399753897 is an apocalyptic number.

It is an amenable number.

399753897 is a deficient number, since it is larger than the sum of its proper divisors (154006455).

399753897 is a wasteful number, since it uses less digits than its factorization.

399753897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 790 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 60.

The square root of 399753897 is about 19993.8464783543. The cubic root of 399753897 is about 736.6551601933.

The spelling of 399753897 in words is "three hundred ninety-nine million, seven hundred fifty-three thousand, eight hundred ninety-seven".