18625993 has 2 divisors, whose sum is σ = 18625994. Its totient is φ = 18625992.

The previous prime is 18625979. The next prime is 18626017. The reversal of 18625993 is 39952681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16875664 + 1750329 = 4108^2 + 1323^2 .

It is a cyclic number.

It is not a de Polignac number, because 18625993 - 2⁵ = 18625961 is a prime.

It is not a weakly prime, because it can be changed into another prime (18625913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9312996 + 9312997.

It is an arithmetic number, because the mean of its divisors is an integer number (9312997).

Almost surely, 2^18625993 is an apocalyptic number.

It is an amenable number.

18625993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18625993 is an equidigital number, since it uses as much as digits as its factorization.

18625993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 18625993 is about 4315.7841697657. The cubic root of 18625993 is about 265.0776703622.

The spelling of 18625993 in words is "eighteen million, six hundred twenty-five thousand, nine hundred ninety-three".