18690769 has 8 divisors (see below), whose sum is σ = 19894248. Its totient is φ = 17498880.

The previous prime is 18690739. The next prime is 18690797. The reversal of 18690769 is 96709681.

It can be written as a sum of positive squares in 4 ways, for example, as 9000000 + 9690769 = 3000^2 + 3113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18690769 - 2⁷ = 18690641 is a prime.

It is a super-2 number, since 2×18690769² = 698689691622722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18690719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559 + ... + 6139.

It is an arithmetic number, because the mean of its divisors is an integer number (2486781).

Almost surely, 2^18690769 is an apocalyptic number.

It is an amenable number.

18690769 is a deficient number, since it is larger than the sum of its proper divisors (1203479).

18690769 is a wasteful number, since it uses less digits than its factorization.

18690769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 18690769 is about 4323.2822022163. The cubic root of 18690769 is about 265.3846035211.

The spelling of 18690769 in words is "eighteen million, six hundred ninety thousand, seven hundred sixty-nine".