13829581 has 4 divisors (see below), whose sum is σ = 13972252. Its totient is φ = 13686912.

The previous prime is 13829579. The next prime is 13829591. The reversal of 13829581 is 18592831.

13829581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18592831 = 2671 ⋅6961.

It can be written as a sum of positive squares in 2 ways, for example, as 5221225 + 8608356 = 2285^2 + 2934^2 .

It is a cyclic number.

It is not a de Polignac number, because 13829581 - 2¹ = 13829579 is a prime.

It is a super-2 number, since 2×13829581² = 382514621271122, 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 13829581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13829561) 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, 71190 + ... + 71383.

It is an arithmetic number, because the mean of its divisors is an integer number (3493063).

Almost surely, 2^13829581 is an apocalyptic number.

It is an amenable number.

13829581 is a deficient number, since it is larger than the sum of its proper divisors (142671).

13829581 is an equidigital number, since it uses as much as digits as its factorization.

13829581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142670.

The product of its digits is 17280, while the sum is 37.

The square root of 13829581 is about 3718.8144616262. The cubic root of 13829581 is about 240.0322931083.

The spelling of 13829581 in words is "thirteen million, eight hundred twenty-nine thousand, five hundred eighty-one".