13873644 has 18 divisors (see below), whose sum is σ = 35069580. Its totient is φ = 4624536.

The previous prime is 13873633. The next prime is 13873661. The reversal of 13873644 is 44637831.

13873644 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 3 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 385379 = 13873644 / (1 + 3 + 8 + 7 + 3 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 13873599 and 13873608.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192654 + ... + 192725.

It is an arithmetic number, because the mean of its divisors is an integer number (1948310).

Almost surely, 2^13873644 is an apocalyptic number.

It is an amenable number.

13873644 is an abundant number, since it is smaller than the sum of its proper divisors (21195936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13873644 is a wasteful number, since it uses less digits than its factorization.

13873644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385389 (or 385384 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 13873644 is about 3724.7340844683. The cubic root of 13873644 is about 240.2869484491.

The spelling of 13873644 in words is "thirteen million, eight hundred seventy-three thousand, six hundred forty-four".