12281840 has 20 divisors (see below), whose sum is σ = 28555464. Its totient is φ = 4912704.

The previous prime is 12281831. The next prime is 12281881. The reversal of 12281840 is 4818221.

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

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76682 + ... + 76841.

Almost surely, 2^12281840 is an apocalyptic number.

12281840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12281840 is an abundant number, since it is smaller than the sum of its proper divisors (16273624).

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

12281840 is a wasteful number, since it uses less digits than its factorization.

12281840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153536 (or 153530 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 12281840 is about 3504.5456196203. The cubic root of 12281840 is about 230.7213646592.

The spelling of 12281840 in words is "twelve million, two hundred eighty-one thousand, eight hundred forty".