18236542 has 8 divisors (see below), whose sum is σ = 28794600. Its totient is φ = 8638344.

The previous prime is 18236527. The next prime is 18236549. The reversal of 18236542 is 24563281.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236549) 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, 239917 + ... + 239992.

It is an arithmetic number, because the mean of its divisors is an integer number (3599325).

Almost surely, 2^18236542 is an apocalyptic number.

18236542 is a deficient number, since it is larger than the sum of its proper divisors (10558058).

18236542 is a wasteful number, since it uses less digits than its factorization.

18236542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479930.

The product of its digits is 11520, while the sum is 31.

The square root of 18236542 is about 4270.4264424060. The cubic root of 18236542 is about 263.2171386462.

The spelling of 18236542 in words is "eighteen million, two hundred thirty-six thousand, five hundred forty-two".