18922793 has 2 divisors, whose sum is σ = 18922794. Its totient is φ = 18922792.

The previous prime is 18922781. The next prime is 18922807. The reversal of 18922793 is 39722981.

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., 18905104 + 17689 = 4348^2 + 133^2 .

It is an emirp because it is prime and its reverse (39722981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18922793 - 2⁴ = 18922777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18922793.

It is not a weakly prime, because it can be changed into another prime (18922723) 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, 9461396 + 9461397.

It is an arithmetic number, because the mean of its divisors is an integer number (9461397).

Almost surely, 2^18922793 is an apocalyptic number.

It is an amenable number.

18922793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18922793 is an equidigital number, since it uses as much as digits as its factorization.

18922793 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18922793 is about 4350.0336780306. The cubic root of 18922793 is about 266.4782368499.

The spelling of 18922793 in words is "eighteen million, nine hundred twenty-two thousand, seven hundred ninety-three".