18913747 has 2 divisors, whose sum is σ = 18913748. Its totient is φ = 18913746.

The previous prime is 18913733. The next prime is 18913781. The reversal of 18913747 is 74731981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18913747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18913717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9456873 + 9456874.

It is an arithmetic number, because the mean of its divisors is an integer number (9456874).

Almost surely, 2^18913747 is an apocalyptic number.

18913747 is a deficient number, since it is larger than the sum of its proper divisors (1).

18913747 is an equidigital number, since it uses as much as digits as its factorization.

18913747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 18913747 is about 4348.9937916718. The cubic root of 18913747 is about 266.4357669680.

The spelling of 18913747 in words is "eighteen million, nine hundred thirteen thousand, seven hundred forty-seven".