18926993 has 2 divisors, whose sum is σ = 18926994. Its totient is φ = 18926992.

The previous prime is 18926987. The next prime is 18927037. The reversal of 18926993 is 39962981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13300609 + 5626384 = 3647^2 + 2372^2 .

It is a cyclic number.

It is not a de Polignac number, because 18926993 - 2¹⁴ = 18910609 is a prime.

It is not a weakly prime, because it can be changed into another prime (18926903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9463496 + 9463497.

It is an arithmetic number, because the mean of its divisors is an integer number (9463497).

Almost surely, 2^18926993 is an apocalyptic number.

It is an amenable number.

18926993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18926993 is an equidigital number, since it uses as much as digits as its factorization.

18926993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 47.

The square root of 18926993 is about 4350.5164061293. The cubic root of 18926993 is about 266.4979507438.

The spelling of 18926993 in words is "eighteen million, nine hundred twenty-six thousand, nine hundred ninety-three".