18764642 has 16 divisors (see below), whose sum is σ = 31631040. Its totient is φ = 8283792.

The previous prime is 18764639. The next prime is 18764657. The reversal of 18764642 is 24646781.

It is a super-2 number, since 2×18764642² = 704223578776328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18764596 and 18764605.

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, 15092 + ... + 16287.

It is an arithmetic number, because the mean of its divisors is an integer number (1976940).

Almost surely, 2^18764642 is an apocalyptic number.

18764642 is a deficient number, since it is larger than the sum of its proper divisors (12866398).

18764642 is a wasteful number, since it uses less digits than its factorization.

18764642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31417.

The product of its digits is 64512, while the sum is 38.

The square root of 18764642 is about 4331.8174015071. The cubic root of 18764642 is about 265.7337773995.

The spelling of 18764642 in words is "eighteen million, seven hundred sixty-four thousand, six hundred forty-two".