117857978 has 16 divisors (see below), whose sum is σ = 205355904. Its totient is φ = 49682160.

The previous prime is 117857951. The next prime is 117858019. The reversal of 117857978 is 879758711.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68150 + ... + 69857.

It is an arithmetic number, because the mean of its divisors is an integer number (12834744).

Almost surely, 2^117857978 is an apocalyptic number.

117857978 is a deficient number, since it is larger than the sum of its proper divisors (87497926).

117857978 is a wasteful number, since it uses less digits than its factorization.

117857978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138077.

The product of its digits is 987840, while the sum is 53.

The square root of 117857978 is about 10856.2414306241. The cubic root of 117857978 is about 490.2899547233.

The spelling of 117857978 in words is "one hundred seventeen million, eight hundred fifty-seven thousand, nine hundred seventy-eight".