13831643 has 4 divisors (see below), whose sum is σ = 15807600. Its totient is φ = 11855688.

The previous prime is 13831633. The next prime is 13831667. The reversal of 13831643 is 34613831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34613831 = 7 ⋅4944833.

It is a cyclic number.

It is not a de Polignac number, because 13831643 - 2⁴ = 13831627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13831603) 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, 987968 + ... + 987981.

It is an arithmetic number, because the mean of its divisors is an integer number (3951900).

Almost surely, 2^13831643 is an apocalyptic number.

13831643 is a deficient number, since it is larger than the sum of its proper divisors (1975957).

13831643 is an equidigital number, since it uses as much as digits as its factorization.

13831643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975956.

The product of its digits is 5184, while the sum is 29.

The square root of 13831643 is about 3719.0916901846. The cubic root of 13831643 is about 240.0442221752.

The spelling of 13831643 in words is "thirteen million, eight hundred thirty-one thousand, six hundred forty-three".