18838769 has 4 divisors (see below), whose sum is σ = 18951744. Its totient is φ = 18725796.

The previous prime is 18838763. The next prime is 18838789. The reversal of 18838769 is 96783881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96783881 = 61 ⋅1586621.

It is a cyclic number.

It is not a de Polignac number, because 18838769 - 2⁴ = 18838753 is a prime.

It is a super-2 number, since 2×18838769² = 709798434870722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18838763) 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, 56237 + ... + 56570.

It is an arithmetic number, because the mean of its divisors is an integer number (4737936).

Almost surely, 2^18838769 is an apocalyptic number.

It is an amenable number.

18838769 is a deficient number, since it is larger than the sum of its proper divisors (112975).

18838769 is a wasteful number, since it uses less digits than its factorization.

18838769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112974.

The product of its digits is 580608, while the sum is 50.

The square root of 18838769 is about 4340.3650768109. The cubic root of 18838769 is about 266.0832319108.

The spelling of 18838769 in words is "eighteen million, eight hundred thirty-eight thousand, seven hundred sixty-nine".