12132440 has 32 divisors (see below), whose sum is σ = 28242000. Its totient is φ = 4685184.

The previous prime is 12132401. The next prime is 12132443. The reversal of 12132440 is 4423121.

It is a super-2 number, since 2×12132440² = 294392200707200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12132443) 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, 4070 + ... + 6389.

Almost surely, 2^12132440 is an apocalyptic number.

12132440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12132440 is an abundant number, since it is smaller than the sum of its proper divisors (16109560).

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

12132440 is a wasteful number, since it uses less digits than its factorization.

12132440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10499 (or 10495 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12132440 is about 3483.1652272036. The cubic root of 12132440 is about 229.7820241087.

Adding to 12132440 its reverse (4423121), we get a palindrome (16555561).

The spelling of 12132440 in words is "twelve million, one hundred thirty-two thousand, four hundred forty".