17920993 has 2 divisors, whose sum is σ = 17920994. Its totient is φ = 17920992.

The previous prime is 17920909. The next prime is 17920997. The reversal of 17920993 is 39902971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 2704 = 4233^2 + 52^2 .

It is a cyclic number.

It is not a de Polignac number, because 17920993 - 2¹⁷ = 17789921 is a prime.

It is not a weakly prime, because it can be changed into another prime (17920997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8960496 + 8960497.

It is an arithmetic number, because the mean of its divisors is an integer number (8960497).

Almost surely, 2^17920993 is an apocalyptic number.

It is an amenable number.

17920993 is a deficient number, since it is larger than the sum of its proper divisors (1).

17920993 is an equidigital number, since it uses as much as digits as its factorization.

17920993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 17920993 is about 4233.3193831791. The cubic root of 17920993 is about 261.6901383104.

The spelling of 17920993 in words is "seventeen million, nine hundred twenty thousand, nine hundred ninety-three".