191390012 has 24 divisors (see below), whose sum is σ = 386875440. Its totient is φ = 81877760.

The previous prime is 191389999. The next prime is 191390027. The reversal of 191390012 is 210093191.

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 7 ways as a sum of consecutive naturals, for example, 127187 + ... + 128682.

It is an arithmetic number, because the mean of its divisors is an integer number (16119810).

Almost surely, 2^191390012 is an apocalyptic number.

It is an amenable number.

191390012 is an abundant number, since it is smaller than the sum of its proper divisors (195485428).

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

191390012 is a wasteful number, since it uses less digits than its factorization.

191390012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255901 (or 255899 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 191390012 is about 13834.3779043367. The cubic root of 191390012 is about 576.2882390637.

The spelling of 191390012 in words is "one hundred ninety-one million, three hundred ninety thousand, twelve".