18921125 has 16 divisors (see below), whose sum is σ = 23752560. Its totient is φ = 15048000.

The previous prime is 18921113. The next prime is 18921127. The reversal of 18921125 is 52112981.

It can be written as a sum of positive squares in 8 ways, for example, as 662596 + 18258529 = 814^2 + 4273^2 .

It is not a de Polignac number, because 18921125 - 2⁴ = 18921109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18921127) 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 15 ways as a sum of consecutive naturals, for example, 28295 + ... + 28955.

It is an arithmetic number, because the mean of its divisors is an integer number (1484535).

Almost surely, 2^18921125 is an apocalyptic number.

It is an amenable number.

18921125 is a deficient number, since it is larger than the sum of its proper divisors (4831435).

18921125 is an equidigital number, since it uses as much as digits as its factorization.

18921125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 895 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 18921125 is about 4349.8419511518. The cubic root of 18921125 is about 266.4704068085.

The spelling of 18921125 in words is "eighteen million, nine hundred twenty-one thousand, one hundred twenty-five".