199491012 has 60 divisors (see below), whose sum is σ = 596016960. Its totient is φ = 56996784.

The previous prime is 199491007. The next prime is 199491031. The reversal of 199491012 is 210194991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41712 + ... + 46247.

It is an arithmetic number, because the mean of its divisors is an integer number (9933616).

Almost surely, 2^199491012 is an apocalyptic number.

199491012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

199491012 is an abundant number, since it is smaller than the sum of its proper divisors (396525948).

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

199491012 is a wasteful number, since it uses less digits than its factorization.

199491012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87982 (or 87971 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 199491012 is about 14124.1287164908. The cubic root of 199491012 is about 584.3070295543.

The spelling of 199491012 in words is "one hundred ninety-nine million, four hundred ninety-one thousand, twelve".