18240769 has 4 divisors (see below), whose sum is σ = 18539860. Its totient is φ = 17941680.

The previous prime is 18240767. The next prime is 18240773. The reversal of 18240769 is 96704281.

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 263169 + 17977600 = 513^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 18240769 - 2¹ = 18240767 is a prime.

It is a super-2 number, since 2×18240769² = 665451307422722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18240763) 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, 149454 + ... + 149575.

It is an arithmetic number, because the mean of its divisors is an integer number (4634965).

Almost surely, 2^18240769 is an apocalyptic number.

It is an amenable number.

18240769 is a deficient number, since it is larger than the sum of its proper divisors (299091).

18240769 is an equidigital number, since it uses as much as digits as its factorization.

18240769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299090.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 18240769 is about 4270.9213291748. The cubic root of 18240769 is about 263.2374738773.

The spelling of 18240769 in words is "eighteen million, two hundred forty thousand, seven hundred sixty-nine".