18706913 has 2 divisors, whose sum is σ = 18706914. Its totient is φ = 18706912.

The previous prime is 18706903. The next prime is 18706951. The reversal of 18706913 is 31960781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 113569 = 4312^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 18706913 - 2⁸ = 18706657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18706903) 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, 9353456 + 9353457.

It is an arithmetic number, because the mean of its divisors is an integer number (9353457).

Almost surely, 2^18706913 is an apocalyptic number.

It is an amenable number.

18706913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18706913 is an equidigital number, since it uses as much as digits as its factorization.

18706913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18706913 is about 4325.1488991710. The cubic root of 18706913 is about 265.4609894651.

The spelling of 18706913 in words is "eighteen million, seven hundred six thousand, nine hundred thirteen".