18416873 has 2 divisors, whose sum is σ = 18416874. Its totient is φ = 18416872.

The previous prime is 18416851. The next prime is 18416887. The reversal of 18416873 is 37861481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 29929 = 4288^2 + 173^2 .

It is a cyclic number.

It is not a de Polignac number, because 18416873 - 2⁸ = 18416617 is a prime.

It is a super-2 number, since 2×18416873² = 678362422196258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18416803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208436 + 9208437.

It is an arithmetic number, because the mean of its divisors is an integer number (9208437).

Almost surely, 2^18416873 is an apocalyptic number.

It is an amenable number.

18416873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18416873 is an equidigital number, since it uses as much as digits as its factorization.

18416873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 18416873 is about 4291.4884364286. The cubic root of 18416873 is about 264.0818970357.

The spelling of 18416873 in words is "eighteen million, four hundred sixteen thousand, eight hundred seventy-three".