18490807 has 2 divisors, whose sum is σ = 18490808. Its totient is φ = 18490806.

The previous prime is 18490789. The next prime is 18490841. The reversal of 18490807 is 70809481.

It is a weak prime.

It is an emirp because it is prime and its reverse (70809481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18490807 is a prime.

It is a super-2 number, since 2×18490807² = 683819887022498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18490847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9245403 + 9245404.

It is an arithmetic number, because the mean of its divisors is an integer number (9245404).

Almost surely, 2^18490807 is an apocalyptic number.

18490807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18490807 is an equidigital number, since it uses as much as digits as its factorization.

18490807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18490807 is about 4300.0938361854. The cubic root of 18490807 is about 264.4348082324.

The spelling of 18490807 in words is "eighteen million, four hundred ninety thousand, eight hundred seven".