18505742 has 8 divisors (see below), whose sum is σ = 27778296. Its totient is φ = 9246312.

The previous prime is 18505727. The next prime is 18505759. The reversal of 18505742 is 24750581.

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 = 18505699 and 18505708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853 + ... + 6359.

It is an arithmetic number, because the mean of its divisors is an integer number (3472287).

Almost surely, 2^18505742 is an apocalyptic number.

18505742 is a deficient number, since it is larger than the sum of its proper divisors (9272554).

18505742 is a wasteful number, since it uses less digits than its factorization.

18505742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 18505742 is about 4301.8300756771. The cubic root of 18505742 is about 264.5059836197.

The spelling of 18505742 in words is "eighteen million, five hundred five thousand, seven hundred forty-two".