18922493 has 8 divisors (see below), whose sum is σ = 19626240. Its totient is φ = 18224640.

The previous prime is 18922489. The next prime is 18922511. The reversal of 18922493 is 39422981.

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

It is a cyclic number.

It is not a de Polignac number, because 18922493 - 2² = 18922489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18922433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5693 + ... + 8381.

It is an arithmetic number, because the mean of its divisors is an integer number (2453280).

Almost surely, 2^18922493 is an apocalyptic number.

It is an amenable number.

18922493 is a deficient number, since it is larger than the sum of its proper divisors (703747).

18922493 is a wasteful number, since it uses less digits than its factorization.

18922493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947.

The product of its digits is 31104, while the sum is 38.

The square root of 18922493 is about 4349.9991954022. Note that the first 3 decimals coincide. The cubic root of 18922493 is about 266.4768286030.

The spelling of 18922493 in words is "eighteen million, nine hundred twenty-two thousand, four hundred ninety-three".