191438880 has 96 divisors (see below), whose sum is σ = 608731200. Its totient is φ = 50568192.

The previous prime is 191438873. The next prime is 191438917. The reversal of 191438880 is 88834191.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50491 + ... + 54149.

It is an arithmetic number, because the mean of its divisors is an integer number (6340950).

Almost surely, 2^191438880 is an apocalyptic number.

191438880 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 191438880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304365600).

191438880 is an abundant number, since it is smaller than the sum of its proper divisors (417292320).

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

191438880 is a wasteful number, since it uses less digits than its factorization.

191438880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786 (or 3778 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 191438880 is about 13836.1439714973. The cubic root of 191438880 is about 576.3372831714.

The spelling of 191438880 in words is "one hundred ninety-one million, four hundred thirty-eight thousand, eight hundred eighty".