18797973 has 8 divisors (see below), whose sum is σ = 26383200. Its totient is φ = 11872368.

The previous prime is 18797963. The next prime is 18797981. The reversal of 18797973 is 37979781.

It is a happy number.

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

It is not a de Polignac number, because 18797973 - 2⁵ = 18797941 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18797963) 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, 164838 + ... + 164951.

It is an arithmetic number, because the mean of its divisors is an integer number (3297900).

Almost surely, 2^18797973 is an apocalyptic number.

It is an amenable number.

18797973 is a deficient number, since it is larger than the sum of its proper divisors (7585227).

18797973 is a wasteful number, since it uses less digits than its factorization.

18797973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329811.

The product of its digits is 666792, while the sum is 51.

The square root of 18797973 is about 4335.6629250900. The cubic root of 18797973 is about 265.8910223121.

The spelling of 18797973 in words is "eighteen million, seven hundred ninety-seven thousand, nine hundred seventy-three".