18472973 has 4 divisors (see below), whose sum is σ = 18481788. Its totient is φ = 18464160.

The previous prime is 18472969. The next prime is 18472981. The reversal of 18472973 is 37927481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6061444 + 12411529 = 2462^2 + 3523^2 .

It is a cyclic number.

It is not a de Polignac number, because 18472973 - 2² = 18472969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18472973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18472963) 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, 743 + ... + 6123.

It is an arithmetic number, because the mean of its divisors is an integer number (4620447).

Almost surely, 2^18472973 is an apocalyptic number.

It is an amenable number.

18472973 is a deficient number, since it is larger than the sum of its proper divisors (8815).

18472973 is an equidigital number, since it uses as much as digits as its factorization.

18472973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8814.

The product of its digits is 84672, while the sum is 41.

The square root of 18472973 is about 4298.0196602622. The cubic root of 18472973 is about 264.3497669229.

The spelling of 18472973 in words is "eighteen million, four hundred seventy-two thousand, nine hundred seventy-three".