18974783 has 2 divisors, whose sum is σ = 18974784. Its totient is φ = 18974782.

The previous prime is 18974779. The next prime is 18974797. The reversal of 18974783 is 38747981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18974783 - 2² = 18974779 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18974743) 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, 9487391 + 9487392.

It is an arithmetic number, because the mean of its divisors is an integer number (9487392).

Almost surely, 2^18974783 is an apocalyptic number.

18974783 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974783 is an equidigital number, since it uses as much as digits as its factorization.

18974783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 18974783 is about 4356.0053948543. The cubic root of 18974783 is about 266.7220615822.

Subtracting from 18974783 its sum of digits (47), we obtain a 4-th power (18974736 = 66⁴).

The spelling of 18974783 in words is "eighteen million, nine hundred seventy-four thousand, seven hundred eighty-three".