117638889 has 4 divisors (see below), whose sum is σ = 156851856. Its totient is φ = 78425924.

The previous prime is 117638887. The next prime is 117638921. The reversal of 117638889 is 988836711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 117638889 - 2¹ = 117638887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117638887) 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, 19606479 + ... + 19606484.

It is an arithmetic number, because the mean of its divisors is an integer number (39212964).

Almost surely, 2^117638889 is an apocalyptic number.

It is an amenable number.

117638889 is a deficient number, since it is larger than the sum of its proper divisors (39212967).

117638889 is an equidigital number, since it uses as much as digits as its factorization.

117638889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39212966.

The product of its digits is 580608, while the sum is 51.

The square root of 117638889 is about 10846.1462741381. The cubic root of 117638889 is about 489.9859623911.

The spelling of 117638889 in words is "one hundred seventeen million, six hundred thirty-eight thousand, eight hundred eighty-nine".