191388812 has 6 divisors (see below), whose sum is σ = 334930428. Its totient is φ = 95694404.

The previous prime is 191388803. The next prime is 191388851. The reversal of 191388812 is 218883191.

It is a self number, because there is not a number n which added to its sum of digits gives 191388812.

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 as a sum of consecutive naturals, namely, 23923598 + ... + 23923605.

It is an arithmetic number, because the mean of its divisors is an integer number (55821738).

Almost surely, 2^191388812 is an apocalyptic number.

It is an amenable number.

191388812 is a deficient number, since it is larger than the sum of its proper divisors (143541616).

191388812 is a wasteful number, since it uses less digits than its factorization.

191388812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47847207 (or 47847205 counting only the distinct ones).

The product of its digits is 27648, while the sum is 41.

The square root of 191388812 is about 13834.3345340497. The cubic root of 191388812 is about 576.2870346342.

It can be divided in two parts, 19 and 1388812, that added together give a palindrome (1388831).

The spelling of 191388812 in words is "one hundred ninety-one million, three hundred eighty-eight thousand, eight hundred twelve".