12281540 has 24 divisors (see below), whose sum is σ = 26913600. Its totient is φ = 4698848.

The previous prime is 12281539. The next prime is 12281573. The reversal of 12281540 is 4518221.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12890 + ... + 13809.

It is an arithmetic number, because the mean of its divisors is an integer number (1121400).

Almost surely, 2^12281540 is an apocalyptic number.

12281540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12281540 is an abundant number, since it is smaller than the sum of its proper divisors (14632060).

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

12281540 is a wasteful number, since it uses less digits than its factorization.

12281540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26731 (or 26729 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12281540 is about 3504.5028178045. The cubic root of 12281540 is about 230.7194860869.

Adding to 12281540 its reverse (4518221), we get a palindrome (16799761).

It can be divided in two parts, 12281 and 540, that added together give a palindrome (12821).

The spelling of 12281540 in words is "twelve million, two hundred eighty-one thousand, five hundred forty".