191439312 has 80 divisors (see below), whose sum is σ = 526127040. Its totient is φ = 59774976.

The previous prime is 191439293. The next prime is 191439323. The reversal of 191439312 is 213934191.

It is a happy number.

It is a congruent number.

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, 230514 + ... + 231342.

It is an arithmetic number, because the mean of its divisors is an integer number (6576588).

Almost surely, 2^191439312 is an apocalyptic number.

191439312 is a gapful number since it is divisible by the number (12) 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 191439312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263063520).

191439312 is an abundant number, since it is smaller than the sum of its proper divisors (334687728).

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

191439312 is a wasteful number, since it uses less digits than its factorization.

191439312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140 (or 1134 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 191439312 is about 13836.1595827744. The cubic root of 191439312 is about 576.3377166910.

The spelling of 191439312 in words is "one hundred ninety-one million, four hundred thirty-nine thousand, three hundred twelve".