438940488644 has 36 divisors (see below), whose sum is σ = 894357831276. Its totient is φ = 187948845504.

The previous prime is 438940488617. The next prime is 438940488661. The reversal of 438940488644 is 446884049834.

It can be written as a sum of positive squares in 2 ways, for example, as 88156735744 + 350783752900 = 296912^2 + 592270^2 .

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, 783527 + ... + 1221390.

It is an arithmetic number, because the mean of its divisors is an integer number (24843273091).

Almost surely, 2^438940488644 is an apocalyptic number.

It is an amenable number.

438940488644 is an abundant number, since it is smaller than the sum of its proper divisors (455417342632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

438940488644 is a wasteful number, since it uses less digits than its factorization.

438940488644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006052 (or 2006043 counting only the distinct ones).

The product of its (nonzero) digits is 84934656, while the sum is 62.

The spelling of 438940488644 in words is "four hundred thirty-eight billion, nine hundred forty million, four hundred eighty-eight thousand, six hundred forty-four".