18993253 has 2 divisors, whose sum is σ = 18993254. Its totient is φ = 18993252.

The previous prime is 18993251. The next prime is 18993263. The reversal of 18993253 is 35239981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18992164 + 1089 = 4358^2 + 33^2 .

It is a cyclic number.

It is not a de Polignac number, because 18993253 - 2¹ = 18993251 is a prime.

Together with 18993251, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18993251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496626 + 9496627.

It is an arithmetic number, because the mean of its divisors is an integer number (9496627).

Almost surely, 2^18993253 is an apocalyptic number.

It is an amenable number.

18993253 is a deficient number, since it is larger than the sum of its proper divisors (1).

18993253 is an equidigital number, since it uses as much as digits as its factorization.

18993253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 18993253 is about 4358.1249408433. The cubic root of 18993253 is about 266.8085756837.

The spelling of 18993253 in words is "eighteen million, nine hundred ninety-three thousand, two hundred fifty-three".