399240603689 has 4 divisors (see below), whose sum is σ = 399247889040. Its totient is φ = 399233318340.

The previous prime is 399240603679. The next prime is 399240603709. The reversal of 399240603689 is 986306042993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 399240603689 - 2⁴ = 399240603673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399240603679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559847 + ... + 3670284.

It is an arithmetic number, because the mean of its divisors is an integer number (99811972260).

Almost surely, 2^399240603689 is an apocalyptic number.

It is an amenable number.

399240603689 is a deficient number, since it is larger than the sum of its proper divisors (7285351).

399240603689 is an equidigital number, since it uses as much as digits as its factorization.

399240603689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7285350.

The product of its (nonzero) digits is 15116544, while the sum is 59.

The spelling of 399240603689 in words is "three hundred ninety-nine billion, two hundred forty million, six hundred three thousand, six hundred eighty-nine".