117806639 has 4 divisors (see below), whose sum is σ = 117913224. Its totient is φ = 117700056.

The previous prime is 117806629. The next prime is 117806641. The reversal of 117806639 is 936608711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936608711 = 743 ⋅1260577.

It is a cyclic number.

It is not a de Polignac number, because 117806639 - 2¹² = 117802543 is a prime.

It is a super-3 number, since 3×117806639³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117806596 and 117806605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117806629) 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, 51617 + ... + 53850.

It is an arithmetic number, because the mean of its divisors is an integer number (29478306).

Almost surely, 2^117806639 is an apocalyptic number.

117806639 is a deficient number, since it is larger than the sum of its proper divisors (106585).

117806639 is a wasteful number, since it uses less digits than its factorization.

117806639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106584.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 117806639 is about 10853.8766807072. The cubic root of 117806639 is about 490.2187541928.

The spelling of 117806639 in words is "one hundred seventeen million, eight hundred six thousand, six hundred thirty-nine".