117878906 has 4 divisors (see below), whose sum is σ = 176818362. Its totient is φ = 58939452.

The previous prime is 117878899. The next prime is 117878923. The reversal of 117878906 is 609878711.

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

It can be written as a sum of positive squares in only one way, i.e., 88078225 + 29800681 = 9385^2 + 5459^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29469725 + ... + 29469728.

Almost surely, 2^117878906 is an apocalyptic number.

117878906 is a deficient number, since it is larger than the sum of its proper divisors (58939456).

117878906 is an equidigital number, since it uses as much as digits as its factorization.

117878906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58939455.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 117878906 is about 10857.2052573395. The cubic root of 117878906 is about 490.3189732112.

The spelling of 117878906 in words is "one hundred seventeen million, eight hundred seventy-eight thousand, nine hundred six".