18397734438 has 8 divisors (see below), whose sum is σ = 36795468888. Its totient is φ = 6132578144.

The previous prime is 18397734419. The next prime is 18397734461. The reversal of 18397734438 is 83443779381.

It is a happy number.

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

18397734438 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1533144531 + ... + 1533144542.

It is an arithmetic number, because the mean of its divisors is an integer number (4599433611).

Almost surely, 2^18397734438 is an apocalyptic number.

18397734438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18397734438 is a wasteful number, since it uses less digits than its factorization.

18397734438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066289078.

The product of its digits is 12192768, while the sum is 57.

The spelling of 18397734438 in words is "eighteen billion, three hundred ninety-seven million, seven hundred thirty-four thousand, four hundred thirty-eight".