399536169407 has 4 divisors (see below), whose sum is σ = 399599423496. Its totient is φ = 399472915320.

The previous prime is 399536169401. The next prime is 399536169419. The reversal of 399536169407 is 704961635993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399536169407 - 2²² = 399531975103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399536169407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399536169401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31617569 + ... + 31630202.

It is an arithmetic number, because the mean of its divisors is an integer number (99899855874).

Almost surely, 2^399536169407 is an apocalyptic number.

399536169407 is a deficient number, since it is larger than the sum of its proper divisors (63254089).

399536169407 is an equidigital number, since it uses as much as digits as its factorization.

399536169407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63254088.

The product of its (nonzero) digits is 33067440, while the sum is 62.

The spelling of 399536169407 in words is "three hundred ninety-nine billion, five hundred thirty-six million, one hundred sixty-nine thousand, four hundred seven".