191972 has 12 divisors (see below), whose sum is σ = 366576. Its totient is φ = 87240.

The previous prime is 191969. The next prime is 191977. The reversal of 191972 is 279191.

It is not an unprimeable number, because it can be changed into a prime (191977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138 + ... + 2225.

It is an arithmetic number, because the mean of its divisors is an integer number (30548).

2¹⁹¹⁹⁷² is an apocalyptic number.

It is an amenable number.

191972 is a deficient number, since it is larger than the sum of its proper divisors (174604).

191972 is a wasteful number, since it uses less digits than its factorization.

191972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378 (or 4376 counting only the distinct ones).

The product of its digits is 1134, while the sum is 29.

The square root of 191972 is about 438.1460943567. The cubic root of 191972 is about 57.6871783018.

It can be divided in two parts, 1919 and 72, that added together give a palindrome (1991).

The spelling of 191972 in words is "one hundred ninety-one thousand, nine hundred seventy-two".