18890493 has 4 divisors (see below), whose sum is σ = 25187328. Its totient is φ = 12593660.

The previous prime is 18890479. The next prime is 18890507. The reversal of 18890493 is 39409881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18890479) and next prime (18890507).

It is a cyclic number.

It is not a de Polignac number, because 18890493 - 2⁴ = 18890477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3148413 + ... + 3148418.

It is an arithmetic number, because the mean of its divisors is an integer number (6296832).

Almost surely, 2^18890493 is an apocalyptic number.

It is an amenable number.

18890493 is a deficient number, since it is larger than the sum of its proper divisors (6296835).

18890493 is an equidigital number, since it uses as much as digits as its factorization.

18890493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6296834.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 18890493 is about 4346.3194774430. The cubic root of 18890493 is about 266.3265300513.

The spelling of 18890493 in words is "eighteen million, eight hundred ninety thousand, four hundred ninety-three".