18840697 has 2 divisors, whose sum is σ = 18840698. Its totient is φ = 18840696.

The previous prime is 18840671. The next prime is 18840707. The reversal of 18840697 is 79604881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 5707321 = 3624^2 + 2389^2 .

It is a cyclic number.

It is not a de Polignac number, because 18840697 - 2¹¹ = 18838649 is a prime.

It is not a weakly prime, because it can be changed into another prime (18840617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9420348 + 9420349.

It is an arithmetic number, because the mean of its divisors is an integer number (9420349).

Almost surely, 2^18840697 is an apocalyptic number.

It is an amenable number.

18840697 is a deficient number, since it is larger than the sum of its proper divisors (1).

18840697 is an equidigital number, since it uses as much as digits as its factorization.

18840697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 18840697 is about 4340.5871722614. The cubic root of 18840697 is about 266.0923087772.

The spelling of 18840697 in words is "eighteen million, eight hundred forty thousand, six hundred ninety-seven".