18973091 has 8 divisors (see below), whose sum is σ = 19846944. Its totient is φ = 18103360.

The previous prime is 18973081. The next prime is 18973093. The reversal of 18973091 is 19037981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18973091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18973093) 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, 12071 + ... + 13551.

It is an arithmetic number, because the mean of its divisors is an integer number (2480868).

Almost surely, 2^18973091 is an apocalyptic number.

18973091 is a deficient number, since it is larger than the sum of its proper divisors (873853).

18973091 is a wasteful number, since it uses less digits than its factorization.

18973091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 18973091 is about 4355.8111758891. The cubic root of 18973091 is about 266.7141333907.

The spelling of 18973091 in words is "eighteen million, nine hundred seventy-three thousand, ninety-one".