117818 has 4 divisors (see below), whose sum is σ = 176730. Its totient is φ = 58908.

The previous prime is 117811. The next prime is 117833. The reversal of 117818 is 818711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818711 = 89 ⋅9199.

It can be written as a sum of positive squares in only one way, i.e., 117649 + 169 = 343^2 + 13^2 .

It is a super-2 number, since 2×117818² = 27762162248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29453 + ... + 29456.

2¹¹⁷⁸¹⁸ is an apocalyptic number.

117818 is a deficient number, since it is larger than the sum of its proper divisors (58912).

117818 is an equidigital number, since it uses as much as digits as its factorization.

117818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58911.

The product of its digits is 448, while the sum is 26.

The square root of 117818 is about 343.2462672776. The cubic root of 117818 is about 49.0234512207.

Subtracting from 117818 its product of digits (448), we obtain a triangular number (117370 = T₄₈₄).

The spelling of 117818 in words is "one hundred seventeen thousand, eight hundred eighteen".