13681444 has 24 divisors (see below), whose sum is σ = 28804160. Its totient is φ = 5554656.

The previous prime is 13681433. The next prime is 13681469. The reversal of 13681444 is 44418631.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12327 + ... + 13390.

Almost surely, 2^13681444 is an apocalyptic number.

13681444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

13681444 is an abundant number, since it is smaller than the sum of its proper divisors (15122716).

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

13681444 is a wasteful number, since it uses less digits than its factorization.

13681444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25747 (or 25745 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 13681444 is about 3698.8436030738. The cubic root of 13681444 is about 239.1721710111.

The spelling of 13681444 in words is "thirteen million, six hundred eighty-one thousand, four hundred forty-four".