399238539 has 16 divisors (see below), whose sum is σ = 621308928. Its totient is φ = 223281792.

The previous prime is 399238537. The next prime is 399238561. The reversal of 399238539 is 935832993.

It is not a de Polignac number, because 399238539 - 2¹ = 399238537 is a prime.

It is a super-2 number, since 2×399238539² = 318782822045709042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399238491 and 399238500.

It is not an unprimeable number, because it can be changed into a prime (399238537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201262 + ... + 203235.

It is an arithmetic number, because the mean of its divisors is an integer number (38831808).

Almost surely, 2^399238539 is an apocalyptic number.

399238539 is a deficient number, since it is larger than the sum of its proper divisors (222070389).

399238539 is a wasteful number, since it uses less digits than its factorization.

399238539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404554.

The product of its digits is 1574640, while the sum is 51.

The square root of 399238539 is about 19980.9544066343. The cubic root of 399238539 is about 736.3384616839.

The spelling of 399238539 in words is "three hundred ninety-nine million, two hundred thirty-eight thousand, five hundred thirty-nine".