13947945 has 16 divisors (see below), whose sum is σ = 24345792. Its totient is φ = 6762560.

The previous prime is 13947937. The next prime is 13947949. The reversal of 13947945 is 54974931.

It is not a de Polignac number, because 13947945 - 2³ = 13947937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13947897 and 13947906.

It is not an unprimeable number, because it can be changed into a prime (13947949) by changing a digit.

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, 42102 + ... + 42431.

It is an arithmetic number, because the mean of its divisors is an integer number (1521612).

Almost surely, 2^13947945 is an apocalyptic number.

13947945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13947945 is a deficient number, since it is larger than the sum of its proper divisors (10397847).

13947945 is a wasteful number, since it uses less digits than its factorization.

13947945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84552.

The product of its digits is 136080, while the sum is 42.

The square root of 13947945 is about 3734.6947666443. The cubic root of 13947945 is about 240.7151412432.

It can be divided in two parts, 1394 and 7945, that added together give a palindrome (9339).

The spelling of 13947945 in words is "thirteen million, nine hundred forty-seven thousand, nine hundred forty-five".