117838890 has 192 divisors, whose sum is σ = 358525440. Its totient is φ = 26611200.

The previous prime is 117838873. The next prime is 117838891. The reversal of 117838890 is 98838711.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (117838891) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 780315 + ... + 780465.

It is an arithmetic number, because the mean of its divisors is an integer number (1867320).

Almost surely, 2^117838890 is an apocalyptic number.

117838890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 117838890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179262720).

117838890 is an abundant number, since it is smaller than the sum of its proper divisors (240686550).

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

117838890 is a wasteful number, since it uses less digits than its factorization.

117838890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 117838890 is about 10855.3622694040. The cubic root of 117838890 is about 490.2634845596.

The spelling of 117838890 in words is "one hundred seventeen million, eight hundred thirty-eight thousand, eight hundred ninety".