18635973 has 8 divisors (see below), whose sum is σ = 25029888. Its totient is φ = 12333024.

The previous prime is 18635971. The next prime is 18635987. The reversal of 18635973 is 37953681.

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

It is not a de Polignac number, because 18635973 - 2¹ = 18635971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18635971) 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, 22261 + ... + 23082.

It is an arithmetic number, because the mean of its divisors is an integer number (3128736).

Almost surely, 2^18635973 is an apocalyptic number.

It is an amenable number.

18635973 is a deficient number, since it is larger than the sum of its proper divisors (6393915).

18635973 is a wasteful number, since it uses less digits than its factorization.

18635973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45483.

The product of its digits is 136080, while the sum is 42.

The square root of 18635973 is about 4316.9402358615. The cubic root of 18635973 is about 265.1250056962.

The spelling of 18635973 in words is "eighteen million, six hundred thirty-five thousand, nine hundred seventy-three".