18869797 has 2 divisors, whose sum is σ = 18869798. Its totient is φ = 18869796.

The previous prime is 18869791. The next prime is 18869833. The reversal of 18869797 is 79796881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17297281 + 1572516 = 4159^2 + 1254^2 .

It is a cyclic number.

It is not a de Polignac number, because 18869797 - 2²³ = 10481189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18869791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9434898 + 9434899.

It is an arithmetic number, because the mean of its divisors is an integer number (9434899).

Almost surely, 2^18869797 is an apocalyptic number.

It is an amenable number.

18869797 is a deficient number, since it is larger than the sum of its proper divisors (1).

18869797 is an equidigital number, since it uses as much as digits as its factorization.

18869797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 18869797 is about 4343.9379599621. The cubic root of 18869797 is about 266.2292340553.

The spelling of 18869797 in words is "eighteen million, eight hundred sixty-nine thousand, seven hundred ninety-seven".