18694997 has 2 divisors, whose sum is σ = 18694998. Its totient is φ = 18694996.

The previous prime is 18694987. The next prime is 18695023. The reversal of 18694997 is 79949681.

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., 15062161 + 3632836 = 3881^2 + 1906^2 .

It is a cyclic number.

It is not a de Polignac number, because 18694997 - 2¹² = 18690901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18694927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9347498 + 9347499.

It is an arithmetic number, because the mean of its divisors is an integer number (9347499).

Almost surely, 2^18694997 is an apocalyptic number.

It is an amenable number.

18694997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18694997 is an equidigital number, since it uses as much as digits as its factorization.

18694997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 18694997 is about 4323.7711549063. The cubic root of 18694997 is about 265.4046127123.

It can be divided in two parts, 18694 and 997, that added together give a palindrome (19691).

The spelling of 18694997 in words is "eighteen million, six hundred ninety-four thousand, nine hundred ninety-seven".