18242420 has 24 divisors (see below), whose sum is σ = 43782144. Its totient is φ = 6254496.

The previous prime is 18242359. The next prime is 18242423. The reversal of 18242420 is 2424281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65012 + ... + 65291.

It is an arithmetic number, because the mean of its divisors is an integer number (1824256).

Almost surely, 2^18242420 is an apocalyptic number.

18242420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18242420 is an abundant number, since it is smaller than the sum of its proper divisors (25539724).

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

18242420 is a wasteful number, since it uses less digits than its factorization.

18242420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130319 (or 130317 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18242420 is about 4271.1146086238. The cubic root of 18242420 is about 263.2454156470.

The spelling of 18242420 in words is "eighteen million, two hundred forty-two thousand, four hundred twenty".