12189040 has 20 divisors (see below), whose sum is σ = 28339704. Its totient is φ = 4875584.

The previous prime is 12189031. The next prime is 12189041. The reversal of 12189040 is 4098121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×12189040² = 297145392243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12188996 and 12189014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12189041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76102 + ... + 76261.

Almost surely, 2^12189040 is an apocalyptic number.

12189040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12189040 is an abundant number, since it is smaller than the sum of its proper divisors (16150664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12189040 is a wasteful number, since it uses less digits than its factorization.

12189040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152376 (or 152370 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12189040 is about 3491.2805673563. The cubic root of 12189040 is about 230.1387946138.

The spelling of 12189040 in words is "twelve million, one hundred eighty-nine thousand, forty".