18343842 has 32 divisors (see below), whose sum is σ = 40371264. Its totient is φ = 5556320.

The previous prime is 18343813. The next prime is 18343849. The reversal of 18343842 is 24834381.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18343849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6838 + ... + 9134.

It is an arithmetic number, because the mean of its divisors is an integer number (1261602).

Almost surely, 2^18343842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18343842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20185632).

18343842 is an abundant number, since it is smaller than the sum of its proper divisors (22027422).

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

18343842 is a wasteful number, since it uses less digits than its factorization.

18343842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335 (or 2313 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 18343842 is about 4282.9711649741. The cubic root of 18343842 is about 263.7323676659.

The spelling of 18343842 in words is "eighteen million, three hundred forty-three thousand, eight hundred forty-two".