191872542 has 16 divisors (see below), whose sum is σ = 386507520. Its totient is φ = 63497112.

The previous prime is 191872537. The next prime is 191872553. The reversal of 191872542 is 245278191.

It is a self number, because there is not a number n which added to its sum of digits gives 191872542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114198 + ... + 115865.

It is an arithmetic number, because the mean of its divisors is an integer number (24156720).

Almost surely, 2^191872542 is an apocalyptic number.

191872542 is an abundant number, since it is smaller than the sum of its proper divisors (194634978).

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

191872542 is a wasteful number, since it uses less digits than its factorization.

191872542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230207.

The product of its digits is 40320, while the sum is 39.

The square root of 191872542 is about 13851.8064525895. The cubic root of 191872542 is about 576.7721427493.

The spelling of 191872542 in words is "one hundred ninety-one million, eight hundred seventy-two thousand, five hundred forty-two".