12133440 has 168 divisors, whose sum is σ = 45646848. Its totient is φ = 2933760.

The previous prime is 12133421. The next prime is 12133463. The reversal of 12133440 is 4433121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31489 + ... + 31871.

Almost surely, 2^12133440 is an apocalyptic number.

12133440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12133440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22823424).

12133440 is an abundant number, since it is smaller than the sum of its proper divisors (33513408).

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

12133440 is a wasteful number, since it uses less digits than its factorization.

12133440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 12133440 is about 3483.3087718432. The cubic root of 12133440 is about 229.7883370930.

Adding to 12133440 its reverse (4433121), we get a palindrome (16566561).

The spelling of 12133440 in words is "twelve million, one hundred thirty-three thousand, four hundred forty".