18290869 has 2 divisors, whose sum is σ = 18290870. Its totient is φ = 18290868.

The previous prime is 18290821. The next prime is 18290873. The reversal of 18290869 is 96809281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15444900 + 2845969 = 3930^2 + 1687^2 .

It is a cyclic number.

It is not a de Polignac number, because 18290869 - 2⁹ = 18290357 is a prime.

It is a super-2 number, since 2×18290869² = 669111777550322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18290809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145434 + 9145435.

It is an arithmetic number, because the mean of its divisors is an integer number (9145435).

Almost surely, 2^18290869 is an apocalyptic number.

It is an amenable number.

18290869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18290869 is an equidigital number, since it uses as much as digits as its factorization.

18290869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 18290869 is about 4276.7825523400. The cubic root of 18290869 is about 263.4782557877.

The spelling of 18290869 in words is "eighteen million, two hundred ninety thousand, eight hundred sixty-nine".