13811945 has 16 divisors (see below), whose sum is σ = 19014528. Its totient is φ = 9434880.

The previous prime is 13811923. The next prime is 13811953. The reversal of 13811945 is 54911831.

It is not a de Polignac number, because 13811945 - 2¹⁰ = 13810921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11210 + ... + 12380.

It is an arithmetic number, because the mean of its divisors is an integer number (1188408).

Almost surely, 2^13811945 is an apocalyptic number.

It is an amenable number.

13811945 is a deficient number, since it is larger than the sum of its proper divisors (5202583).

13811945 is a wasteful number, since it uses less digits than its factorization.

13811945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its digits is 4320, while the sum is 32.

The square root of 13811945 is about 3716.4425193994. The cubic root of 13811945 is about 239.9302169802.

The spelling of 13811945 in words is "thirteen million, eight hundred eleven thousand, nine hundred forty-five".