18768258 has 12 divisors (see below), whose sum is σ = 40664598. Its totient is φ = 6256080.

The previous prime is 18768247. The next prime is 18768259. The reversal of 18768258 is 85286781.

It can be written as a sum of positive squares in only one way, i.e., 18636489 + 131769 = 4317^2 + 363^2 .

It is not an unprimeable number, because it can be changed into a prime (18768259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 521323 + ... + 521358.

Almost surely, 2^18768258 is an apocalyptic number.

18768258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18768258 is an abundant number, since it is smaller than the sum of its proper divisors (21896340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18768258 is a wasteful number, since it uses less digits than its factorization.

18768258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042689 (or 1042686 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 18768258 is about 4332.2347581820. The cubic root of 18768258 is about 265.7508455220.

The spelling of 18768258 in words is "eighteen million, seven hundred sixty-eight thousand, two hundred fifty-eight".