18764641 has 16 divisors (see below), whose sum is σ = 22663168. Its totient is φ = 15195600.

The previous prime is 18764639. The next prime is 18764657. The reversal of 18764641 is 14646781.

It is a happy number.

It is not a de Polignac number, because 18764641 - 2¹ = 18764639 is a prime.

It is a super-2 number, since 2×18764641² = 704223503717762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18764641.

It is not an unprimeable number, because it can be changed into a prime (18764611) 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, 8326 + ... + 10336.

It is an arithmetic number, because the mean of its divisors is an integer number (1416448).

Almost surely, 2^18764641 is an apocalyptic number.

It is an amenable number.

18764641 is a deficient number, since it is larger than the sum of its proper divisors (3898527).

18764641 is a wasteful number, since it uses less digits than its factorization.

18764641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2092.

The product of its digits is 32256, while the sum is 37.

The square root of 18764641 is about 4331.8172860821. The cubic root of 18764641 is about 265.7337726790.

The spelling of 18764641 in words is "eighteen million, seven hundred sixty-four thousand, six hundred forty-one".