13873645 has 4 divisors (see below), whose sum is σ = 16648380. Its totient is φ = 11098912.

The previous prime is 13873633. The next prime is 13873661. The reversal of 13873645 is 54637831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54637831 = 5227 ⋅10453.

It can be written as a sum of positive squares in 2 ways, for example, as 6245001 + 7628644 = 2499^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 13873645 - 2¹⁵ = 13840877 is a prime.

It is a super-3 number, since 3×13873645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1387360 + ... + 1387369.

It is an arithmetic number, because the mean of its divisors is an integer number (4162095).

Almost surely, 2^13873645 is an apocalyptic number.

It is an amenable number.

13873645 is a deficient number, since it is larger than the sum of its proper divisors (2774735).

13873645 is an equidigital number, since it uses as much as digits as its factorization.

13873645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2774734.

The product of its digits is 60480, while the sum is 37.

The square root of 13873645 is about 3724.7342187061. The cubic root of 13873645 is about 240.2869542223.

The spelling of 13873645 in words is "thirteen million, eight hundred seventy-three thousand, six hundred forty-five".