18940569 has 16 divisors (see below), whose sum is σ = 26466432. Its totient is φ = 12025728.

The previous prime is 18940553. The next prime is 18940573. The reversal of 18940569 is 96504981.

It is not a de Polignac number, because 18940569 - 2⁴ = 18940553 is a prime.

It is a super-2 number, since 2×18940569² = 717490308087522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18940569.

It is not an unprimeable number, because it can be changed into a prime (18940589) 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, 21159 + ... + 22035.

It is an arithmetic number, because the mean of its divisors is an integer number (1654152).

Almost surely, 2^18940569 is an apocalyptic number.

It is an amenable number.

18940569 is a deficient number, since it is larger than the sum of its proper divisors (7525863).

18940569 is a wasteful number, since it uses less digits than its factorization.

18940569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 18940569 is about 4352.0764009838. The cubic root of 18940569 is about 266.5616536167.

The spelling of 18940569 in words is "eighteen million, nine hundred forty thousand, five hundred sixty-nine".