18059869 has 2 divisors, whose sum is σ = 18059870. Its totient is φ = 18059868.

The previous prime is 18059857. The next prime is 18059879. The reversal of 18059869 is 96895081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 99225 = 4238^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 18059869 - 2¹⁷ = 17928797 is a prime.

It is a super-2 number, since 2×18059869² = 652317736594322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18059809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9029934 + 9029935.

It is an arithmetic number, because the mean of its divisors is an integer number (9029935).

Almost surely, 2^18059869 is an apocalyptic number.

It is an amenable number.

18059869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18059869 is an equidigital number, since it uses as much as digits as its factorization.

18059869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 18059869 is about 4249.6904593158. The cubic root of 18059869 is about 262.3643755936.

The spelling of 18059869 in words is "eighteen million, fifty-nine thousand, eight hundred sixty-nine".