18340542 has 48 divisors (see below), whose sum is σ = 43655040. Its totient is φ = 5518800.

The previous prime is 18340523. The next prime is 18340547. The reversal of 18340542 is 24504381.

18340542 is a `hidden beast` number, since 1 + 83 + 40 + 542 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41559 + ... + 41997.

It is an arithmetic number, because the mean of its divisors is an integer number (909480).

Almost surely, 2^18340542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18340542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21827520).

18340542 is an abundant number, since it is smaller than the sum of its proper divisors (25314498).

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

18340542 is a wasteful number, since it uses less digits than its factorization.

18340542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18340542 is about 4282.5859010649. The cubic root of 18340542 is about 263.7165518405.

The spelling of 18340542 in words is "eighteen million, three hundred forty thousand, five hundred forty-two".