18121375 has 16 divisors (see below), whose sum is σ = 23400000. Its totient is φ = 13994400.

The previous prime is 18121351. The next prime is 18121387. The reversal of 18121375 is 57312181.

It is not a de Polignac number, because 18121375 - 2¹¹ = 18119327 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 1126 + ... + 6124.

It is an arithmetic number, because the mean of its divisors is an integer number (1462500).

Almost surely, 2^18121375 is an apocalyptic number.

18121375 is a deficient number, since it is larger than the sum of its proper divisors (5278625).

18121375 is an equidigital number, since it uses as much as digits as its factorization.

18121375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043 (or 5033 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 18121375 is about 4256.9208355336. The cubic root of 18121375 is about 262.6618804975.

It can be divided in two parts, 18121 and 375, that added together give a square (18496 = 136²).

The spelling of 18121375 in words is "eighteen million, one hundred twenty-one thousand, three hundred seventy-five".