18231973 has 8 divisors (see below), whose sum is σ = 19593792. Its totient is φ = 16902336.

The previous prime is 18231943. The next prime is 18231977. The reversal of 18231973 is 37913281.

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

It is a cyclic number.

It is not a de Polignac number, because 18231973 - 2⁹ = 18231461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6865 + ... + 9142.

It is an arithmetic number, because the mean of its divisors is an integer number (2449224).

Almost surely, 2^18231973 is an apocalyptic number.

It is an amenable number.

18231973 is a deficient number, since it is larger than the sum of its proper divisors (1361819).

18231973 is a wasteful number, since it uses less digits than its factorization.

18231973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16091.

The product of its digits is 9072, while the sum is 34.

The square root of 18231973 is about 4269.8914506109. The cubic root of 18231973 is about 263.1951545888.

The spelling of 18231973 in words is "eighteen million, two hundred thirty-one thousand, nine hundred seventy-three".