13781396 has 12 divisors (see below), whose sum is σ = 24149748. Its totient is φ = 6881472.

The previous prime is 13781381. The next prime is 13781399. The reversal of 13781396 is 69318731.

It can be written as a sum of positive squares in 2 ways, for example, as 5290000 + 8491396 = 2300^2 + 2914^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910 + ... + 5586.

It is an arithmetic number, because the mean of its divisors is an integer number (2012479).

Almost surely, 2^13781396 is an apocalyptic number.

It is an amenable number.

13781396 is a deficient number, since it is larger than the sum of its proper divisors (10368352).

13781396 is a wasteful number, since it uses less digits than its factorization.

13781396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618 (or 4616 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 13781396 is about 3712.3302654802. The cubic root of 13781396 is about 239.7531953589.

The spelling of 13781396 in words is "thirteen million, seven hundred eighty-one thousand, three hundred ninety-six".