18836869 has 2 divisors, whose sum is σ = 18836870. Its totient is φ = 18836868.

The previous prime is 18836837. The next prime is 18836887. The reversal of 18836869 is 96863881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 2067844 = 4095^2 + 1438^2 .

It is a cyclic number.

It is not a de Polignac number, because 18836869 - 2⁵ = 18836837 is a prime.

It is a super-2 number, since 2×18836869² = 709655267446322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18836819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9418434 + 9418435.

It is an arithmetic number, because the mean of its divisors is an integer number (9418435).

Almost surely, 2^18836869 is an apocalyptic number.

It is an amenable number.

18836869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18836869 is an equidigital number, since it uses as much as digits as its factorization.

18836869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 18836869 is about 4340.1461956943. The cubic root of 18836869 is about 266.0742862601.

The spelling of 18836869 in words is "eighteen million, eight hundred thirty-six thousand, eight hundred sixty-nine".