13817945 has 4 divisors (see below), whose sum is σ = 16581540. Its totient is φ = 11054352.

The previous prime is 13817933. The next prime is 13817987. The reversal of 13817945 is 54971831.

13817945 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: 54971831 = 3767 ⋅14593.

It can be written as a sum of positive squares in 2 ways, for example, as 1901641 + 11916304 = 1379^2 + 3452^2 .

It is a cyclic number.

It is not a de Polignac number, because 13817945 - 2⁴ = 13817929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13817899 and 13817908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381790 + ... + 1381799.

It is an arithmetic number, because the mean of its divisors is an integer number (4145385).

Almost surely, 2^13817945 is an apocalyptic number.

It is an amenable number.

13817945 is a deficient number, since it is larger than the sum of its proper divisors (2763595).

13817945 is an equidigital number, since it uses as much as digits as its factorization.

13817945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763594.

The product of its digits is 30240, while the sum is 38.

The square root of 13817945 is about 3717.2496553231. The cubic root of 13817945 is about 239.9649543735.

The spelling of 13817945 in words is "thirteen million, eight hundred seventeen thousand, nine hundred forty-five".