13899643 has 8 divisors (see below), whose sum is σ = 14213376. Its totient is φ = 13588800.

The previous prime is 13899637. The next prime is 13899649. The reversal of 13899643 is 34699831.

13899643 = T₂₈₂ + T₂₈₃ + ... + T₄₇₂.

It is an interprime number because it is at equal distance from previous prime (13899637) and next prime (13899649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13899643 - 2⁹ = 13899131 is a prime.

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 13899643.

It is not an unprimeable number, because it can be changed into a prime (13899649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11055 + ... + 12247.

It is an arithmetic number, because the mean of its divisors is an integer number (1776672).

Almost surely, 2^13899643 is an apocalyptic number.

13899643 is a deficient number, since it is larger than the sum of its proper divisors (313733).

13899643 is a wasteful number, since it uses less digits than its factorization.

13899643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445.

The product of its digits is 139968, while the sum is 43.

The square root of 13899643 is about 3728.2224987251. Note that the first 3 decimals coincide. The cubic root of 13899643 is about 240.4369528274.

The spelling of 13899643 in words is "thirteen million, eight hundred ninety-nine thousand, six hundred forty-three".