117621840 has 160 divisors (see below), whose sum is σ = 424901376. Its totient is φ = 26357760.

The previous prime is 117621821. The next prime is 117621877. The reversal of 117621840 is 48126711.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 117621798 and 117621807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88380 + ... + 89700.

Almost surely, 2^117621840 is an apocalyptic number.

117621840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 117621840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212450688).

117621840 is an abundant number, since it is smaller than the sum of its proper divisors (307279536).

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

117621840 is a wasteful number, since it uses less digits than its factorization.

117621840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 117621840 is about 10845.3602983027. The cubic root of 117621840 is about 489.9622905869.

The spelling of 117621840 in words is "one hundred seventeen million, six hundred twenty-one thousand, eight hundred forty".