18861424 has 20 divisors (see below), whose sum is σ = 36628360. Its totient is φ = 9408960.

The previous prime is 18861421. The next prime is 18861439. The reversal of 18861424 is 42416881.

It is a self number, because there is not a number n which added to its sum of digits gives 18861424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861421) 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, 7567 + ... + 9745.

It is an arithmetic number, because the mean of its divisors is an integer number (1831418).

Almost surely, 2^18861424 is an apocalyptic number.

It is an amenable number.

18861424 is a deficient number, since it is larger than the sum of its proper divisors (17766936).

18861424 is a wasteful number, since it uses less digits than its factorization.

18861424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728 (or 2722 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 18861424 is about 4342.9740961696. The cubic root of 18861424 is about 266.1898507105.

The spelling of 18861424 in words is "eighteen million, eight hundred sixty-one thousand, four hundred twenty-four".