17890993 has 4 divisors (see below), whose sum is σ = 17944420. Its totient is φ = 17837568.

The previous prime is 17890991. The next prime is 17891009. The reversal of 17890993 is 39909871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2782224 + 15108769 = 1668^2 + 3887^2 .

It is a cyclic number.

It is not a de Polignac number, because 17890993 - 2¹ = 17890991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17890991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26208 + ... + 26881.

It is an arithmetic number, because the mean of its divisors is an integer number (4486105).

Almost surely, 2^17890993 is an apocalyptic number.

It is an amenable number.

17890993 is a deficient number, since it is larger than the sum of its proper divisors (53427).

17890993 is an equidigital number, since it uses as much as digits as its factorization.

17890993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53426.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 17890993 is about 4229.7745802820. The cubic root of 17890993 is about 261.5440324006.

The spelling of 17890993 in words is "seventeen million, eight hundred ninety thousand, nine hundred ninety-three".