399438477 has 24 divisors (see below), whose sum is σ = 623915136. Its totient is φ = 245291136.

The previous prime is 399438469. The next prime is 399438499. The reversal of 399438477 is 774834993.

It is not a de Polignac number, because 399438477 - 2³ = 399438469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399438427) 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, 20583 + ... + 34964.

It is an arithmetic number, because the mean of its divisors is an integer number (25996464).

Almost surely, 2^399438477 is an apocalyptic number.

It is an amenable number.

399438477 is a deficient number, since it is larger than the sum of its proper divisors (224476659).

399438477 is a wasteful number, since it uses less digits than its factorization.

399438477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55617 (or 55614 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 399438477 is about 19985.9569948502. The cubic root of 399438477 is about 736.4613601983.

The spelling of 399438477 in words is "three hundred ninety-nine million, four hundred thirty-eight thousand, four hundred seventy-seven".