191889432 has 128 divisors (see below), whose sum is σ = 613440000. Its totient is φ = 54442368.

The previous prime is 191889427. The next prime is 191889457. The reversal of 191889432 is 234988191.

It is a super-2 number, since 2×191889432² = 73643108226565248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

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, 270294 + ... + 271002.

It is an arithmetic number, because the mean of its divisors is an integer number (4792500).

Almost surely, 2^191889432 is an apocalyptic number.

191889432 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 191889432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (306720000).

191889432 is an abundant number, since it is smaller than the sum of its proper divisors (421550568).

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

191889432 is a wasteful number, since it uses less digits than its factorization.

191889432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 900 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 191889432 is about 13852.4161069468. The cubic root of 191889432 is about 576.7890661290.

The spelling of 191889432 in words is "one hundred ninety-one million, eight hundred eighty-nine thousand, four hundred thirty-two".