12109375 has 18 divisors (see below), whose sum is σ = 15624992. Its totient is φ = 9375000.

The previous prime is 12109369. The next prime is 12109381. The reversal of 12109375 is 57390121.

It is an interprime number because it is at equal distance from previous prime (12109369) and next prime (12109381).

It is not a de Polignac number, because 12109375 - 2³ = 12109367 is a prime.

It is a nialpdrome in base 5.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 390610 + ... + 390640.

Almost surely, 2^12109375 is an apocalyptic number.

12109375 is a deficient number, since it is larger than the sum of its proper divisors (3515617).

12109375 is an frugal number, since it uses more digits than its factorization.

12109375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 12109375 is about 3479.8527267688. The cubic root of 12109375 is about 229.6363187518.

Adding to 12109375 its reverse (57390121), we get a palindrome (69499496).

It can be divided in two parts, 1210 and 9375, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 12109375 in words is "twelve million, one hundred nine thousand, three hundred seventy-five".