109784639 has 4 divisors (see below), whose sum is σ = 110222280. Its totient is φ = 109347000.

The previous prime is 109784629. The next prime is 109784669. The reversal of 109784639 is 936487901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109784639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109784593 and 109784602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109784629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218444 + ... + 218945.

It is an arithmetic number, because the mean of its divisors is an integer number (27555570).

Almost surely, 2^109784639 is an apocalyptic number.

109784639 is a deficient number, since it is larger than the sum of its proper divisors (437641).

109784639 is an equidigital number, since it uses as much as digits as its factorization.

109784639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437640.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 109784639 is about 10477.8165187218. The cubic root of 109784639 is about 478.8290890024.

The spelling of 109784639 in words is "one hundred nine million, seven hundred eighty-four thousand, six hundred thirty-nine".