109642639 has 8 divisors (see below), whose sum is σ = 116197200. Its totient is φ = 103099776.

The previous prime is 109642583. The next prime is 109642667. The reversal of 109642639 is 936246901.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109642639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109642699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23037 + ... + 27385.

It is an arithmetic number, because the mean of its divisors is an integer number (14524650).

Almost surely, 2^109642639 is an apocalyptic number.

109642639 is a deficient number, since it is larger than the sum of its proper divisors (6554561).

109642639 is a wasteful number, since it uses less digits than its factorization.

109642639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5849.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 109642639 is about 10471.0381051737. The cubic root of 109642639 is about 478.6225541367.

The spelling of 109642639 in words is "one hundred nine million, six hundred forty-two thousand, six hundred thirty-nine".