18343172 has 6 divisors (see below), whose sum is σ = 32100558. Its totient is φ = 9171584.

The previous prime is 18343147. The next prime is 18343181. The reversal of 18343172 is 27134381.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 568516 = 4216^2 + 754^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2292893 + ... + 2292900.

It is an arithmetic number, because the mean of its divisors is an integer number (5350093).

Almost surely, 2^18343172 is an apocalyptic number.

It is an amenable number.

18343172 is a deficient number, since it is larger than the sum of its proper divisors (13757386).

18343172 is a wasteful number, since it uses less digits than its factorization.

18343172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585797 (or 4585795 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 18343172 is about 4282.8929475297. The cubic root of 18343172 is about 263.7291567276.

The spelling of 18343172 in words is "eighteen million, three hundred forty-three thousand, one hundred seventy-two".