18840769 has 4 divisors (see below), whose sum is σ = 18908100. Its totient is φ = 18773440.

The previous prime is 18840763. The next prime is 18840791. The reversal of 18840769 is 96704881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9840769 + 9000000 = 3137^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 18840769 - 2⁵ = 18840737 is a prime.

It is a super-2 number, since 2×18840769² = 709949153022722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18840763) 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, 33244 + ... + 33805.

It is an arithmetic number, because the mean of its divisors is an integer number (4727025).

Almost surely, 2^18840769 is an apocalyptic number.

It is an amenable number.

18840769 is a deficient number, since it is larger than the sum of its proper divisors (67331).

18840769 is an equidigital number, since it uses as much as digits as its factorization.

18840769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67330.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18840769 is about 4340.5954660622. The cubic root of 18840769 is about 266.0926477354.

The spelling of 18840769 in words is "eighteen million, eight hundred forty thousand, seven hundred sixty-nine".