399513537 has 12 divisors (see below), whose sum is σ = 577442580. Its totient is φ = 266172768.

The previous prime is 399513533. The next prime is 399513547. The reversal of 399513537 is 735315993.

It can be written as a sum of positive squares in 2 ways, for example, as 295289856 + 104223681 = 17184^2 + 10209^2 .

It is not a de Polignac number, because 399513537 - 2² = 399513533 is a prime.

It is a super-2 number, since 2×399513537² = 319222132492500738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399513492 and 399513501.

It is not an unprimeable number, because it can be changed into a prime (399513533) 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, 1723 + ... + 28319.

It is an arithmetic number, because the mean of its divisors is an integer number (48120215).

Almost surely, 2^399513537 is an apocalyptic number.

It is an amenable number.

399513537 is a deficient number, since it is larger than the sum of its proper divisors (177929043).

399513537 is a wasteful number, since it uses less digits than its factorization.

399513537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28272 (or 28269 counting only the distinct ones).

The product of its digits is 382725, while the sum is 45.

The square root of 399513537 is about 19987.8347251522. The cubic root of 399513537 is about 736.5074877253.

The spelling of 399513537 in words is "three hundred ninety-nine million, five hundred thirteen thousand, five hundred thirty-seven".