18418023 has 20 divisors (see below), whose sum is σ = 29631448. Its totient is φ = 11333520.

The previous prime is 18418019. The next prime is 18418027. The reversal of 18418023 is 32081481.

It is an interprime number because it is at equal distance from previous prime (18418019) and next prime (18418027).

It is not a de Polignac number, because 18418023 - 2² = 18418019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7693 + ... + 9798.

Almost surely, 2^18418023 is an apocalyptic number.

18418023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18418023 is a deficient number, since it is larger than the sum of its proper divisors (11213425).

18418023 is a wasteful number, since it uses less digits than its factorization.

18418023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17516 (or 17507 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18418023 is about 4291.6224204839. The cubic root of 18418023 is about 264.0873935870.

The spelling of 18418023 in words is "eighteen million, four hundred eighteen thousand, twenty-three".