117921998 has 8 divisors (see below), whose sum is σ = 176972040. Its totient is φ = 58931320.

The previous prime is 117921971. The next prime is 117922019. The reversal of 117921998 is 899129711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×117921998² = 27811195224624008, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9488 + ... + 18051.

It is an arithmetic number, because the mean of its divisors is an integer number (22121505).

Almost surely, 2^117921998 is an apocalyptic number.

117921998 is a deficient number, since it is larger than the sum of its proper divisors (59050042).

117921998 is a wasteful number, since it uses less digits than its factorization.

117921998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29682.

The product of its digits is 81648, while the sum is 47.

The square root of 117921998 is about 10859.1895646038. The cubic root of 117921998 is about 490.3787131929.

The spelling of 117921998 in words is "one hundred seventeen million, nine hundred twenty-one thousand, nine hundred ninety-eight".