117408921 has 16 divisors (see below), whose sum is σ = 180495744. Its totient is φ = 66495744.

The previous prime is 117408887. The next prime is 117408947. The reversal of 117408921 is 129804711.

It is not a de Polignac number, because 117408921 - 2¹⁹ = 116884633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117408971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22366 + ... + 27111.

It is an arithmetic number, because the mean of its divisors is an integer number (11280984).

Almost surely, 2^117408921 is an apocalyptic number.

It is an amenable number.

117408921 is a deficient number, since it is larger than the sum of its proper divisors (63086823).

117408921 is a wasteful number, since it uses less digits than its factorization.

117408921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49600.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 117408921 is about 10835.5397189065. The cubic root of 117408921 is about 489.6664688461. Note that the first 3 decimals are identical.

The spelling of 117408921 in words is "one hundred seventeen million, four hundred eight thousand, nine hundred twenty-one".