13931945 has 4 divisors (see below), whose sum is σ = 16718340. Its totient is φ = 11145552.

The previous prime is 13931933. The next prime is 13931987. The reversal of 13931945 is 54913931.

13931945 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6620329 + 7311616 = 2573^2 + 2704^2 .

It is a cyclic number.

It is not a de Polignac number, because 13931945 - 2¹⁸ = 13669801 is a prime.

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, 1393190 + ... + 1393199.

It is an arithmetic number, because the mean of its divisors is an integer number (4179585).

Almost surely, 2^13931945 is an apocalyptic number.

It is an amenable number.

13931945 is a deficient number, since it is larger than the sum of its proper divisors (2786395).

13931945 is an equidigital number, since it uses as much as digits as its factorization.

13931945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786394.

The product of its digits is 14580, while the sum is 35.

The square root of 13931945 is about 3732.5520759930. The cubic root of 13931945 is about 240.6230627831.

The spelling of 13931945 in words is "thirteen million, nine hundred thirty-one thousand, nine hundred forty-five".