13671945 has 24 divisors (see below), whose sum is σ = 27084096. Its totient is φ = 6249888.

The previous prime is 13671941. The next prime is 13671947. The reversal of 13671945 is 54917631.

It is not a de Polignac number, because 13671945 - 2² = 13671941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13671941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21387 + ... + 22016.

It is an arithmetic number, because the mean of its divisors is an integer number (1128504).

Almost surely, 2^13671945 is an apocalyptic number.

13671945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13671945 is a deficient number, since it is larger than the sum of its proper divisors (13412151).

13671945 is a wasteful number, since it uses less digits than its factorization.

13671945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43421 (or 43418 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 13671945 is about 3697.5593301528. The cubic root of 13671945 is about 239.1168059378.

The spelling of 13671945 in words is "thirteen million, six hundred seventy-one thousand, nine hundred forty-five".