399536550523 has 12 divisors (see below), whose sum is σ = 439183008040. Its totient is φ = 363196025280.

The previous prime is 399536550509. The next prime is 399536550559. The reversal of 399536550523 is 325055635993.

It is a happy number.

It is not a de Polignac number, because 399536550523 - 2²¹ = 399534453371 is a prime.

It is a super-3 number, since 3×399536550523³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399536550563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2569411 + ... + 2720467.

Almost surely, 2^399536550523 is an apocalyptic number.

399536550523 is a deficient number, since it is larger than the sum of its proper divisors (39646457517).

399536550523 is a wasteful number, since it uses less digits than its factorization.

399536550523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172938 (or 172927 counting only the distinct ones).

The product of its (nonzero) digits is 16402500, while the sum is 55.

It can be divided in two parts, 399536 and 550523, that added together give a palindrome (950059).

The spelling of 399536550523 in words is "three hundred ninety-nine billion, five hundred thirty-six million, five hundred fifty thousand, five hundred twenty-three".