438693421540 has 24 divisors (see below), whose sum is σ = 1005006748032. Its totient is φ = 159524880480.

The previous prime is 438693421459. The next prime is 438693421571. The reversal of 438693421540 is 45124396834.

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, 997030284 + ... + 997030723.

It is an arithmetic number, because the mean of its divisors is an integer number (41875281168).

Almost surely, 2^438693421540 is an apocalyptic number.

It is an amenable number.

438693421540 is an abundant number, since it is smaller than the sum of its proper divisors (566313326492).

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

438693421540 is a wasteful number, since it uses less digits than its factorization.

438693421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994061027 (or 1994061025 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 438693421540 in words is "four hundred thirty-eight billion, six hundred ninety-three million, four hundred twenty-one thousand, five hundred forty".