438744665 has 12 divisors (see below), whose sum is σ = 550383204. Its totient is φ = 335733024.

The previous prime is 438744617. The next prime is 438744701. The reversal of 438744665 is 566447834.

It can be written as a sum of positive squares in 2 ways, for example, as 236052496 + 202692169 = 15364^2 + 14237^2 .

It is not a de Polignac number, because 438744665 - 2⁶ = 438744601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80294 + ... + 85583.

It is an arithmetic number, because the mean of its divisors is an integer number (45865267).

Almost surely, 2^438744665 is an apocalyptic number.

It is an amenable number.

438744665 is a deficient number, since it is larger than the sum of its proper divisors (111638539).

438744665 is a wasteful number, since it uses less digits than its factorization.

438744665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165928 (or 165905 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 47.

The square root of 438744665 is about 20946.2327161712. The cubic root of 438744665 is about 759.8664729635.

The spelling of 438744665 in words is "four hundred thirty-eight million, seven hundred forty-four thousand, six hundred sixty-five".