18258869 has 2 divisors, whose sum is σ = 18258870. Its totient is φ = 18258868.

The previous prime is 18258859. The next prime is 18258887. The reversal of 18258869 is 96885281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18190225 + 68644 = 4265^2 + 262^2 .

It is an emirp because it is prime and its reverse (96885281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18258869 - 2¹² = 18254773 is a prime.

It is a super-2 number, since 2×18258869² = 666772594318322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18258839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9129434 + 9129435.

It is an arithmetic number, because the mean of its divisors is an integer number (9129435).

Almost surely, 2^18258869 is an apocalyptic number.

It is an amenable number.

18258869 is a deficient number, since it is larger than the sum of its proper divisors (1).

18258869 is an equidigital number, since it uses as much as digits as its factorization.

18258869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The square root of 18258869 is about 4273.0397845094. The cubic root of 18258869 is about 263.3245137604.

The spelling of 18258869 in words is "eighteen million, two hundred fifty-eight thousand, eight hundred sixty-nine".