399728571 has 16 divisors (see below), whose sum is σ = 581914368. Its totient is φ = 242055200.

The previous prime is 399728543. The next prime is 399728579. The reversal of 399728571 is 175827993.

It is a cyclic number.

It is not a de Polignac number, because 399728571 - 2⁷ = 399728443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399728579) 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, 40681 + ... + 49541.

It is an arithmetic number, because the mean of its divisors is an integer number (36369648).

Almost surely, 2^399728571 is an apocalyptic number.

399728571 is a deficient number, since it is larger than the sum of its proper divisors (182185797).

399728571 is a wasteful number, since it uses less digits than its factorization.

399728571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10242.

The product of its digits is 952560, while the sum is 51.

The square root of 399728571 is about 19993.2131234577. The cubic root of 399728571 is about 736.6396031862.

The spelling of 399728571 in words is "three hundred ninety-nine million, seven hundred twenty-eight thousand, five hundred seventy-one".