438664503979 has 4 divisors (see below), whose sum is σ = 472407927376. Its totient is φ = 404921080584.

The previous prime is 438664503943. The next prime is 438664504007. The reversal of 438664503979 is 979305466834.

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 438664503979 - 2¹⁵ = 438664471211 is a prime.

It is a super-2 number, since 2×438664503979² (a number of 24 digits) contains 22 as substring.

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 438664503979.

It is not an unprimeable number, because it can be changed into a prime (438664503919) 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, 16871711679 + ... + 16871711704.

It is an arithmetic number, because the mean of its divisors is an integer number (118101981844).

Almost surely, 2^438664503979 is an apocalyptic number.

438664503979 is a deficient number, since it is larger than the sum of its proper divisors (33743423397).

438664503979 is a wasteful number, since it uses less digits than its factorization.

438664503979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33743423396.

The product of its (nonzero) digits is 117573120, while the sum is 64.

The spelling of 438664503979 in words is "four hundred thirty-eight billion, six hundred sixty-four million, five hundred three thousand, nine hundred seventy-nine".