18696973 has 4 divisors (see below), whose sum is σ = 18816220. Its totient is φ = 18577728.

The previous prime is 18696949. The next prime is 18696983. The reversal of 18696973 is 37969681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14040009 + 4656964 = 3747^2 + 2158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18696973 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 (18696913) 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, 59388 + ... + 59701.

It is an arithmetic number, because the mean of its divisors is an integer number (4704055).

Almost surely, 2^18696973 is an apocalyptic number.

It is an amenable number.

18696973 is a deficient number, since it is larger than the sum of its proper divisors (119247).

18696973 is a wasteful number, since it uses less digits than its factorization.

18696973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119246.

The product of its digits is 489888, while the sum is 49.

The square root of 18696973 is about 4323.9996530990. Note that the first 3 decimals coincide. The cubic root of 18696973 is about 265.4139631825.

The spelling of 18696973 in words is "eighteen million, six hundred ninety-six thousand, nine hundred seventy-three".