18690869 has 2 divisors, whose sum is σ = 18690870. Its totient is φ = 18690868.

The previous prime is 18690857. The next prime is 18690887. The reversal of 18690869 is 96809681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 1592644 = 4135^2 + 1262^2 .

It is a cyclic number.

It is not a de Polignac number, because 18690869 - 2¹⁶ = 18625333 is a prime.

It is a super-2 number, since 2×18690869² = 698697167950322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18690569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9345434 + 9345435.

It is an arithmetic number, because the mean of its divisors is an integer number (9345435).

Almost surely, 2^18690869 is an apocalyptic number.

It is an amenable number.

18690869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690869 is an equidigital number, since it uses as much as digits as its factorization.

18690869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 18690869 is about 4323.2937674879. The cubic root of 18690869 is about 265.3850768103.

The spelling of 18690869 in words is "eighteen million, six hundred ninety thousand, eight hundred sixty-nine".