13993645 has 4 divisors (see below), whose sum is σ = 16792380. Its totient is φ = 11194912.

The previous prime is 13993621. The next prime is 13993691. The reversal of 13993645 is 54639931.

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 1841449 + 12152196 = 1357^2 + 3486^2 .

It is a cyclic number.

It is not a de Polignac number, because 13993645 - 2⁷ = 13993517 is a prime.

It is a super-3 number, since 3×13993645³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13993598 and 13993607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399360 + ... + 1399369.

It is an arithmetic number, because the mean of its divisors is an integer number (4198095).

Almost surely, 2^13993645 is an apocalyptic number.

It is an amenable number.

13993645 is a deficient number, since it is larger than the sum of its proper divisors (2798735).

13993645 is an equidigital number, since it uses as much as digits as its factorization.

13993645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798734.

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

The square root of 13993645 is about 3740.8080677843. The cubic root of 13993645 is about 240.9777531504.

The spelling of 13993645 in words is "thirteen million, nine hundred ninety-three thousand, six hundred forty-five".