399385477 has 4 divisors (see below), whose sum is σ = 413157420. Its totient is φ = 385613536.

The previous prime is 399385451. The next prime is 399385489. The reversal of 399385477 is 774583993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 310252996 + 89132481 = 17614^2 + 9441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399385477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399185477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6885928 + ... + 6885985.

It is an arithmetic number, because the mean of its divisors is an integer number (103289355).

Almost surely, 2^399385477 is an apocalyptic number.

It is an amenable number.

399385477 is a deficient number, since it is larger than the sum of its proper divisors (13771943).

399385477 is a wasteful number, since it uses less digits than its factorization.

399385477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13771942.

The product of its digits is 5715360, while the sum is 55.

The square root of 399385477 is about 19984.6310198612. The cubic root of 399385477 is about 736.4287859882.

The spelling of 399385477 in words is "three hundred ninety-nine million, three hundred eighty-five thousand, four hundred seventy-seven".