18994597 has 2 divisors, whose sum is σ = 18994598. Its totient is φ = 18994596.

The previous prime is 18994571. The next prime is 18994609. The reversal of 18994597 is 79549981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 599076 = 4289^2 + 774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18994597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18995597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497298 + 9497299.

It is an arithmetic number, because the mean of its divisors is an integer number (9497299).

Almost surely, 2^18994597 is an apocalyptic number.

It is an amenable number.

18994597 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994597 is an equidigital number, since it uses as much as digits as its factorization.

18994597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 18994597 is about 4358.2791328688. The cubic root of 18994597 is about 266.8148688355.

It can be divided in two parts, 18994 and 597, that added together give a palindrome (19591).

The spelling of 18994597 in words is "eighteen million, nine hundred ninety-four thousand, five hundred ninety-seven".