18381542 has 8 divisors (see below), whose sum is σ = 27825600. Its totient is φ = 9106344.

The previous prime is 18381521. The next prime is 18381547. The reversal of 18381542 is 24518381.

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

It is a junction number, because it is equal to n+sod(n) for n = 18381499 and 18381508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18381547) 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 3 ways as a sum of consecutive naturals, for example, 41942 + ... + 42377.

It is an arithmetic number, because the mean of its divisors is an integer number (3478200).

Almost surely, 2^18381542 is an apocalyptic number.

18381542 is a deficient number, since it is larger than the sum of its proper divisors (9444058).

18381542 is a wasteful number, since it uses less digits than its factorization.

18381542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84430.

The product of its digits is 7680, while the sum is 32.

The square root of 18381542 is about 4287.3700563399. The cubic root of 18381542 is about 263.9129170233.

The spelling of 18381542 in words is "eighteen million, three hundred eighty-one thousand, five hundred forty-two".