13723381 has 6 divisors (see below), whose sum is σ = 15963990. Its totient is φ = 11762856.

The previous prime is 13723379. The next prime is 13723399. The reversal of 13723381 is 18332731.

It can be written as a sum of positive squares in only one way, i.e., 12895281 + 828100 = 3591^2 + 910^2 .

It is not a de Polignac number, because 13723381 - 2¹ = 13723379 is a prime.

It is a super-2 number, since 2×13723381² = 376662372142322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13723361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139986 + ... + 140083.

It is an arithmetic number, because the mean of its divisors is an integer number (2660665).

Almost surely, 2^13723381 is an apocalyptic number.

It is an amenable number.

13723381 is a deficient number, since it is larger than the sum of its proper divisors (2240609).

13723381 is an equidigital number, since it uses as much as digits as its factorization.

13723381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280083 (or 280076 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 13723381 is about 3704.5081994780. The cubic root of 13723381 is about 239.4162956430.

It can be divided in two parts, 1372 and 3381, that added together give a triangular number (4753 = T₉₇).

The spelling of 13723381 in words is "thirteen million, seven hundred twenty-three thousand, three hundred eighty-one".