18218023 has 8 divisors (see below), whose sum is σ = 18862592. Its totient is φ = 17581536.

The previous prime is 18217993. The next prime is 18218027. The reversal of 18218023 is 32081281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18218023 - 2¹³ = 18209831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2761 + ... + 6637.

It is an arithmetic number, because the mean of its divisors is an integer number (2357824).

Almost surely, 2^18218023 is an apocalyptic number.

18218023 is a deficient number, since it is larger than the sum of its proper divisors (644569).

18218023 is a wasteful number, since it uses less digits than its factorization.

18218023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18218023 is about 4268.2576070336. The cubic root of 18218023 is about 263.1280104710.

The spelling of 18218023 in words is "eighteen million, two hundred eighteen thousand, twenty-three".