18897677 has 2 divisors, whose sum is σ = 18897678. Its totient is φ = 18897676.

The previous prime is 18897673. The next prime is 18897691. The reversal of 18897677 is 77679881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 70756 = 4339^2 + 266^2 .

It is an emirp because it is prime and its reverse (77679881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18897677 - 2² = 18897673 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 (18897673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448838 + 9448839.

It is an arithmetic number, because the mean of its divisors is an integer number (9448839).

Almost surely, 2^18897677 is an apocalyptic number.

It is an amenable number.

18897677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18897677 is an equidigital number, since it uses as much as digits as its factorization.

18897677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 53.

The square root of 18897677 is about 4347.1458452645. The cubic root of 18897677 is about 266.3602868429.

The spelling of 18897677 in words is "eighteen million, eight hundred ninety-seven thousand, six hundred seventy-seven".