191942772 has 48 divisors (see below), whose sum is σ = 515784192. Its totient is φ = 54419040.

The previous prime is 191942761. The next prime is 191942789. The reversal of 191942772 is 277249191.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2283 + ... + 19725.

It is an arithmetic number, because the mean of its divisors is an integer number (10745504).

Almost surely, 2^191942772 is an apocalyptic number.

191942772 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 191942772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257892096).

191942772 is an abundant number, since it is smaller than the sum of its proper divisors (323841420).

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

191942772 is a wasteful number, since it uses less digits than its factorization.

191942772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17588 (or 17586 counting only the distinct ones).

The product of its digits is 63504, while the sum is 42.

The square root of 191942772 is about 13854.3412690752. The cubic root of 191942772 is about 576.8425050256.

The spelling of 191942772 in words is "one hundred ninety-one million, nine hundred forty-two thousand, seven hundred seventy-two".