18747642 has 32 divisors (see below), whose sum is σ = 40320000. Its totient is φ = 5792688.

The previous prime is 18747611. The next prime is 18747649. The reversal of 18747642 is 24674781.

It is a self number, because there is not a number n which added to its sum of digits gives 18747642.

It is not an unprimeable number, because it can be changed into a prime (18747649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3609 + ... + 7107.

It is an arithmetic number, because the mean of its divisors is an integer number (1260000).

Almost surely, 2^18747642 is an apocalyptic number.

18747642 is an abundant number, since it is smaller than the sum of its proper divisors (21572358).

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

18747642 is a wasteful number, since it uses less digits than its factorization.

18747642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570.

The product of its digits is 75264, while the sum is 39.

The square root of 18747642 is about 4329.8547319743. The cubic root of 18747642 is about 265.6535051670.

The spelling of 18747642 in words is "eighteen million, seven hundred forty-seven thousand, six hundred forty-two".