13939645 has 8 divisors (see below), whose sum is σ = 16751160. Its totient is φ = 11136000.

The previous prime is 13939637. The next prime is 13939661. The reversal of 13939645 is 54693931.

It can be written as a sum of positive squares in 4 ways, for example, as 4356 + 13935289 = 66^2 + 3733^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13939645 - 2³ = 13939637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13939598 and 13939607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3145 + ... + 6145.

It is an arithmetic number, because the mean of its divisors is an integer number (2093895).

Almost surely, 2^13939645 is an apocalyptic number.

It is an amenable number.

13939645 is a deficient number, since it is larger than the sum of its proper divisors (2811515).

13939645 is an equidigital number, since it uses as much as digits as its factorization.

13939645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935.

The product of its digits is 87480, while the sum is 40.

The square root of 13939645 is about 3733.5833993631. The cubic root of 13939645 is about 240.6673843369.

The spelling of 13939645 in words is "thirteen million, nine hundred thirty-nine thousand, six hundred forty-five".