13731312 has 40 divisors (see below), whose sum is σ = 40541056. Its totient is φ = 3923136.

The previous prime is 13731307. The next prime is 13731313. The reversal of 13731312 is 21313731.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13731313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20098 + ... + 20769.

Almost surely, 2^13731312 is an apocalyptic number.

13731312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13731312 is an abundant number, since it is smaller than the sum of its proper divisors (26809744).

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

13731312 is a wasteful number, since it uses less digits than its factorization.

13731312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40885 (or 40879 counting only the distinct ones).

The product of its digits is 378, while the sum is 21.

The square root of 13731312 is about 3705.5784973469. The cubic root of 13731312 is about 239.4624078213.

The spelling of 13731312 in words is "thirteen million, seven hundred thirty-one thousand, three hundred twelve".