117138947 has 4 divisors (see below), whose sum is σ = 117165360. Its totient is φ = 117112536.

The previous prime is 117138911. The next prime is 117138949. The reversal of 117138947 is 749831711.

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

It is a cyclic number.

It is not a de Polignac number, because 117138947 - 2²⁰ = 116090371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117138949) 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, 4748 + ... + 16025.

It is an arithmetic number, because the mean of its divisors is an integer number (29291340).

Almost surely, 2^117138947 is an apocalyptic number.

117138947 is a deficient number, since it is larger than the sum of its proper divisors (26413).

117138947 is an equidigital number, since it uses as much as digits as its factorization.

117138947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26412.

The product of its digits is 42336, while the sum is 41.

The square root of 117138947 is about 10823.0747479633. The cubic root of 117138947 is about 489.2908623192.

The spelling of 117138947 in words is "one hundred seventeen million, one hundred thirty-eight thousand, nine hundred forty-seven".