18809807 has 2 divisors, whose sum is σ = 18809808. Its totient is φ = 18809806.

The previous prime is 18809797. The next prime is 18809873. The reversal of 18809807 is 70890881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18809807 - 2¹² = 18805711 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 (18809887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9404903 + 9404904.

It is an arithmetic number, because the mean of its divisors is an integer number (9404904).

Almost surely, 2^18809807 is an apocalyptic number.

18809807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18809807 is an equidigital number, since it uses as much as digits as its factorization.

18809807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 18809807 is about 4337.0274382346. The cubic root of 18809807 is about 265.9468065944.

The spelling of 18809807 in words is "eighteen million, eight hundred nine thousand, eight hundred seven".