13805919 has 12 divisors (see below), whose sum is σ = 20059416. Its totient is φ = 9149712.

The previous prime is 13805903. The next prime is 13805923. The reversal of 13805919 is 91950831.

It is a happy number.

It is not a de Polignac number, because 13805919 - 2⁴ = 13805903 is a prime.

It is a super-2 number, since 2×13805919² = 381206798869122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13805969) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2877 + ... + 5990.

It is an arithmetic number, because the mean of its divisors is an integer number (1671618).

Almost surely, 2^13805919 is an apocalyptic number.

13805919 is a deficient number, since it is larger than the sum of its proper divisors (6253497).

13805919 is a wasteful number, since it uses less digits than its factorization.

13805919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046 (or 9043 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 13805919 is about 3715.6317094136. The cubic root of 13805919 is about 239.8953189311.

The spelling of 13805919 in words is "thirteen million, eight hundred five thousand, nine hundred nineteen".