18816793 has 2 divisors, whose sum is σ = 18816794. Its totient is φ = 18816792.

The previous prime is 18816767. The next prime is 18816823. The reversal of 18816793 is 39761881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14768649 + 4048144 = 3843^2 + 2012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18816793 is a prime.

It is not a weakly prime, because it can be changed into another prime (18816713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9408396 + 9408397.

It is an arithmetic number, because the mean of its divisors is an integer number (9408397).

Almost surely, 2^18816793 is an apocalyptic number.

It is an amenable number.

18816793 is a deficient number, since it is larger than the sum of its proper divisors (1).

18816793 is an equidigital number, since it uses as much as digits as its factorization.

18816793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 18816793 is about 4337.8327538069. The cubic root of 18816793 is about 265.9797269114.

The spelling of 18816793 in words is "eighteen million, eight hundred sixteen thousand, seven hundred ninety-three".