399664741 has 32 divisors (see below), whose sum is σ = 485365760. Its totient is φ = 321926400.

The previous prime is 399664739. The next prime is 399664789. The reversal of 399664741 is 147466993.

It is a cyclic number.

It is not a de Polignac number, because 399664741 - 2¹ = 399664739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399664711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1442695 + ... + 1442971.

It is an arithmetic number, because the mean of its divisors is an integer number (15167680).

Almost surely, 2^399664741 is an apocalyptic number.

399664741 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

399664741 is a deficient number, since it is larger than the sum of its proper divisors (85701019).

399664741 is a wasteful number, since it uses less digits than its factorization.

399664741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485.

The product of its digits is 979776, while the sum is 49.

The square root of 399664741 is about 19991.6167680355. The cubic root of 399664741 is about 736.6003914041.

The spelling of 399664741 in words is "three hundred ninety-nine million, six hundred sixty-four thousand, seven hundred forty-one".