191772642 has 16 divisors (see below), whose sum is σ = 384199200. Its totient is φ = 63815232.

The previous prime is 191772611. The next prime is 191772649. The reversal of 191772642 is 246277191.

It is a self number, because there is not a number n which added to its sum of digits gives 191772642.

It is not an unprimeable number, because it can be changed into a prime (191772649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23392 + ... + 30507.

It is an arithmetic number, because the mean of its divisors is an integer number (24012450).

Almost surely, 2^191772642 is an apocalyptic number.

191772642 is an abundant number, since it is smaller than the sum of its proper divisors (192426558).

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

191772642 is a wasteful number, since it uses less digits than its factorization.

191772642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54497.

The product of its digits is 42336, while the sum is 39.

The square root of 191772642 is about 13848.1999552288. The cubic root of 191772642 is about 576.6720250021.

The spelling of 191772642 in words is "one hundred ninety-one million, seven hundred seventy-two thousand, six hundred forty-two".