399385465 has 8 divisors (see below), whose sum is σ = 479504520. Its totient is φ = 319347072.

The previous prime is 399385451. The next prime is 399385489. The reversal of 399385465 is 564583993.

It can be written as a sum of positive squares in 4 ways, for example, as 106667584 + 292717881 = 10328^2 + 17109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399385465 - 2¹⁷ = 399254393 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8674 + ... + 29563.

It is an arithmetic number, because the mean of its divisors is an integer number (59938065).

Almost surely, 2^399385465 is an apocalyptic number.

It is an amenable number.

399385465 is a deficient number, since it is larger than the sum of its proper divisors (80119055).

399385465 is a wasteful number, since it uses less digits than its factorization.

399385465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40331.

The product of its digits is 3499200, while the sum is 52.

The square root of 399385465 is about 19984.6307196305. The cubic root of 399385465 is about 736.4287786126.

The spelling of 399385465 in words is "three hundred ninety-nine million, three hundred eighty-five thousand, four hundred sixty-five".