12440681 has 16 divisors (see below), whose sum is σ = 14299200. Its totient is φ = 10718400.

The previous prime is 12440663. The next prime is 12440693. The reversal of 12440681 is 18604421.

It is a de Polignac number, because none of the positive numbers 2^k-12440681 is a prime.

It is a super-2 number, since 2×12440681² = 309541087487522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12440681.

It is not an unprimeable number, because it can be changed into a prime (12440381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18491 + ... + 19151.

It is an arithmetic number, because the mean of its divisors is an integer number (893700).

Almost surely, 2^12440681 is an apocalyptic number.

12440681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12440681 is a deficient number, since it is larger than the sum of its proper divisors (1858519).

12440681 is a wasteful number, since it uses less digits than its factorization.

12440681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 12440681 is about 3527.1349563066. The cubic root of 12440681 is about 231.7117468875.

The spelling of 12440681 in words is "twelve million, four hundred forty thousand, six hundred eighty-one".