117639 has 8 divisors (see below), whose sum is σ = 174320. Its totient is φ = 78408.

The previous prime is 117619. The next prime is 117643. The reversal of 117639 is 936711.

It is not a de Polignac number, because 117639 - 2⁷ = 117511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4357 = 117639 / (1 + 1 + 7 + 6 + 3 + 9).

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117619) 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, 2152 + ... + 2205.

It is an arithmetic number, because the mean of its divisors is an integer number (21790).

117639 is a Friedman number, since it can be written as 7^6-9-3+1+1, using all its digits and the basic arithmetic operations.

2¹¹⁷⁶³⁹ is an apocalyptic number.

117639 is a deficient number, since it is larger than the sum of its proper divisors (56681).

117639 is an equidigital number, since it uses as much as digits as its factorization.

117639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366 (or 4360 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 117639 is about 342.9854224307. The cubic root of 117639 is about 48.9986116502.

The spelling of 117639 in words is "one hundred seventeen thousand, six hundred thirty-nine".