13905845 has 4 divisors (see below), whose sum is σ = 16687020. Its totient is φ = 11124672.

The previous prime is 13905841. The next prime is 13905851. The reversal of 13905845 is 54850931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54850931 = 443 ⋅123817.

It can be written as a sum of positive squares in 2 ways, for example, as 1697809 + 12208036 = 1303^2 + 3494^2 .

It is a cyclic number.

It is not a de Polignac number, because 13905845 - 2² = 13905841 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13905841) 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, 1390580 + ... + 1390589.

It is an arithmetic number, because the mean of its divisors is an integer number (4171755).

Almost surely, 2^13905845 is an apocalyptic number.

It is an amenable number.

13905845 is a deficient number, since it is larger than the sum of its proper divisors (2781175).

13905845 is an equidigital number, since it uses as much as digits as its factorization.

13905845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781174.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 13905845 is about 3729.0541696253. The cubic root of 13905845 is about 240.4727083800.

The spelling of 13905845 in words is "thirteen million, nine hundred five thousand, eight hundred forty-five".