117201978 has 40 divisors (see below), whose sum is σ = 278073972. Its totient is φ = 36768384.

The previous prime is 117201947. The next prime is 117201983. The reversal of 117201978 is 879102711.

It can be written as a sum of positive squares in 2 ways, for example, as 91527489 + 25674489 = 9567^2 + 5067^2 .

It is a super-2 number, since 2×117201978² = 27472607294224968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18525 + ... + 24032.

Almost surely, 2^117201978 is an apocalyptic number.

117201978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

117201978 is an abundant number, since it is smaller than the sum of its proper divisors (160871994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

117201978 is a wasteful number, since it uses less digits than its factorization.

117201978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42588 (or 42579 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 117201978 is about 10825.9862368285. The cubic root of 117201978 is about 489.3786070109.

The spelling of 117201978 in words is "one hundred seventeen million, two hundred one thousand, nine hundred seventy-eight".