438989665 has 8 divisors (see below), whose sum is σ = 539636328. Its totient is φ = 342625920.

The previous prime is 438989659. The next prime is 438989671. The reversal of 438989665 is 566989834.

It is an interprime number because it is at equal distance from previous prime (438989659) and next prime (438989671).

It can be written as a sum of positive squares in 4 ways, for example, as 63250209 + 375739456 = 7953^2 + 19384^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 438989665 - 2⁵ = 438989633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070502 + ... + 1070911.

It is an arithmetic number, because the mean of its divisors is an integer number (67454541).

Almost surely, 2^438989665 is an apocalyptic number.

It is an amenable number.

438989665 is a deficient number, since it is larger than the sum of its proper divisors (100646663).

438989665 is a wasteful number, since it uses less digits than its factorization.

438989665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141459.

The product of its digits is 11197440, while the sum is 58.

The square root of 438989665 is about 20952.0802069866. The cubic root of 438989665 is about 760.0078859985.

The spelling of 438989665 in words is "four hundred thirty-eight million, nine hundred eighty-nine thousand, six hundred sixty-five".