12120440 has 16 divisors (see below), whose sum is σ = 27271080. Its totient is φ = 4848160.

The previous prime is 12120431. The next prime is 12120443. The reversal of 12120440 is 4402121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151466 + ... + 151545.

Almost surely, 2^12120440 is an apocalyptic number.

12120440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120440 is an abundant number, since it is smaller than the sum of its proper divisors (15150640).

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

12120440 is a wasteful number, since it uses less digits than its factorization.

12120440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303022 (or 303018 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 12120440 is about 3481.4422298812. The cubic root of 12120440 is about 229.7062412246.

Subtracting from 12120440 its sum of digits (14), we obtain a triangular number (12120426 = T₄₉₂₃).

Adding to 12120440 its reverse (4402121), we get a palindrome (16522561).

The spelling of 12120440 in words is "twelve million, one hundred twenty thousand, four hundred forty".