18123042 has 24 divisors (see below), whose sum is σ = 42164496. Its totient is φ = 5177928.

The previous prime is 18123041. The next prime is 18123043. The reversal of 18123042 is 24032181.

It is an interprime number because it is at equal distance from previous prime (18123041) and next prime (18123043).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (18123041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30528 + ... + 31115.

It is an arithmetic number, because the mean of its divisors is an integer number (1756854).

Almost surely, 2^18123042 is an apocalyptic number.

18123042 is an abundant number, since it is smaller than the sum of its proper divisors (24041454).

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

18123042 is a wasteful number, since it uses less digits than its factorization.

18123042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61662 (or 61655 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18123042 is about 4257.1166298329. The cubic root of 18123042 is about 262.6699344104.

The spelling of 18123042 in words is "eighteen million, one hundred twenty-three thousand, forty-two".