18774421438 has 32 divisors (see below), whose sum is σ = 29831074560. Its totient is φ = 8847360000.

The previous prime is 18774421423. The next prime is 18774421459. The reversal of 18774421438 is 83412447781.

It is a junction number, because it is equal to n+sod(n) for n = 18774421391 and 18774421400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1521598 + ... + 1533886.

It is an arithmetic number, because the mean of its divisors is an integer number (932221080).

Almost surely, 2^18774421438 is an apocalyptic number.

18774421438 is a deficient number, since it is larger than the sum of its proper divisors (11056653122).

18774421438 is a wasteful number, since it uses less digits than its factorization.

18774421438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12964.

The product of its digits is 1204224, while the sum is 49.

The spelling of 18774421438 in words is "eighteen billion, seven hundred seventy-four million, four hundred twenty-one thousand, four hundred thirty-eight".