438642878089 has 4 divisors (see below), whose sum is σ = 472384637956. Its totient is φ = 404901118224.

The previous prime is 438642878087. The next prime is 438642878117. The reversal of 438642878089 is 980878246834.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36889732489 + 401753145600 = 192067^2 + 633840^2 .

It is a cyclic number.

It is not a de Polignac number, because 438642878089 - 2¹ = 438642878087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438642878087) 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, 16870879914 + ... + 16870879939.

It is an arithmetic number, because the mean of its divisors is an integer number (118096159489).

Almost surely, 2^438642878089 is an apocalyptic number.

It is an amenable number.

438642878089 is a deficient number, since it is larger than the sum of its proper divisors (33741759867).

438642878089 is a wasteful number, since it uses less digits than its factorization.

438642878089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33741759866.

The product of its (nonzero) digits is 148635648, while the sum is 67.

The spelling of 438642878089 in words is "four hundred thirty-eight billion, six hundred forty-two million, eight hundred seventy-eight thousand, eighty-nine".