18031242 has 8 divisors (see below), whose sum is σ = 36062496. Its totient is φ = 6010412.

The previous prime is 18031217. The next prime is 18031249. The reversal of 18031242 is 24213081.

It is a sphenic number, since it is the product of 3 distinct primes.

18031242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18031249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502598 + ... + 1502609.

It is an arithmetic number, because the mean of its divisors is an integer number (4507812).

Almost surely, 2^18031242 is an apocalyptic number.

18031242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18031242 is a wasteful number, since it uses less digits than its factorization.

18031242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3005212.

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

The square root of 18031242 is about 4246.3209958740. The cubic root of 18031242 is about 262.2256762315.

The spelling of 18031242 in words is "eighteen million, thirty-one thousand, two hundred forty-two".