18722542 has 8 divisors (see below), whose sum is σ = 29735856. Its totient is φ = 8810592.

The previous prime is 18722513. The next prime is 18722549. The reversal of 18722542 is 24522781.

It is a happy number.

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 (18722549) 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, 275298 + ... + 275365.

It is an arithmetic number, because the mean of its divisors is an integer number (3716982).

Almost surely, 2^18722542 is an apocalyptic number.

18722542 is a deficient number, since it is larger than the sum of its proper divisors (11013314).

18722542 is a wasteful number, since it uses less digits than its factorization.

18722542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550682.

The product of its digits is 8960, while the sum is 31.

The square root of 18722542 is about 4326.9552805639. The cubic root of 18722542 is about 265.5348968119.

The spelling of 18722542 in words is "eighteen million, seven hundred twenty-two thousand, five hundred forty-two".