12189940 has 24 divisors (see below), whose sum is σ = 29256192. Its totient is φ = 4179360.

The previous prime is 12189929. The next prime is 12189949. The reversal of 12189940 is 4998121.

It is a junction number, because it is equal to n+sod(n) for n = 12189896 and 12189905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12189949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43396 + ... + 43675.

It is an arithmetic number, because the mean of its divisors is an integer number (1219008).

Almost surely, 2^12189940 is an apocalyptic number.

12189940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12189940 is an abundant number, since it is smaller than the sum of its proper divisors (17066252).

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

12189940 is a wasteful number, since it uses less digits than its factorization.

12189940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87087 (or 87085 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 12189940 is about 3491.4094575114. The cubic root of 12189940 is about 230.1444587136.

The spelling of 12189940 in words is "twelve million, one hundred eighty-nine thousand, nine hundred forty".