399728833 has 16 divisors (see below), whose sum is σ = 464464000. Its totient is φ = 336949632.

The previous prime is 399728831. The next prime is 399728851. The reversal of 399728833 is 338827993.

It is a cyclic number.

It is not a de Polignac number, because 399728833 - 2¹ = 399728831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399728831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104173 + ... + 107941.

It is an arithmetic number, because the mean of its divisors is an integer number (29029000).

Almost surely, 2^399728833 is an apocalyptic number.

It is an amenable number.

399728833 is a deficient number, since it is larger than the sum of its proper divisors (64735167).

399728833 is a wasteful number, since it uses less digits than its factorization.

399728833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4024.

The product of its digits is 1959552, while the sum is 52.

The square root of 399728833 is about 19993.2196756801. The cubic root of 399728833 is about 736.6397641284.

The spelling of 399728833 in words is "three hundred ninety-nine million, seven hundred twenty-eight thousand, eight hundred thirty-three".