399999537 has 12 divisors (see below), whose sum is σ = 660316800. Its totient is φ = 228571128.

The previous prime is 399999529. The next prime is 399999599. The reversal of 399999537 is 735999993.

399999537 is a `hidden beast` number, since 3 + 9 + 9 + 9 + 99 + 537 = 666.

It is not a de Polignac number, because 399999537 - 2³ = 399999529 is a prime.

It is a super-3 number, since 3×399999537³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 6349199 = 399999537 / (3 + 9 + 9 + 9 + 9 + 9 + 5 + 3 + 7).

It is not an unprimeable number, because it can be changed into a prime (399999737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3174537 + ... + 3174662.

It is an arithmetic number, because the mean of its divisors is an integer number (55026400).

Almost surely, 2^399999537 is an apocalyptic number.

It is an amenable number.

399999537 is a deficient number, since it is larger than the sum of its proper divisors (260317263).

399999537 is a wasteful number, since it uses less digits than its factorization.

399999537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349212 (or 6349209 counting only the distinct ones).

The product of its digits is 18600435, while the sum is 63.

The square root of 399999537 is about 19999.9884249967. The cubic root of 399999537 is about 736.8060154435.

The spelling of 399999537 in words is "three hundred ninety-nine million, nine hundred ninety-nine thousand, five hundred thirty-seven".