18904793 has 2 divisors, whose sum is σ = 18904794. Its totient is φ = 18904792.

The previous prime is 18904789. The next prime is 18904807. The reversal of 18904793 is 39740981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15936064 + 2968729 = 3992^2 + 1723^2 .

It is a cyclic number.

It is not a de Polignac number, because 18904793 - 2² = 18904789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18904793.

It is not a weakly prime, because it can be changed into another prime (18904783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9452396 + 9452397.

It is an arithmetic number, because the mean of its divisors is an integer number (9452397).

Almost surely, 2^18904793 is an apocalyptic number.

It is an amenable number.

18904793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18904793 is an equidigital number, since it uses as much as digits as its factorization.

18904793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18904793 is about 4347.9642362835. The cubic root of 18904793 is about 266.3937156772.

The spelling of 18904793 in words is "eighteen million, nine hundred four thousand, seven hundred ninety-three".