191978130 has 32 divisors (see below), whose sum is σ = 461415168. Its totient is φ = 51120000.

The previous prime is 191978119. The next prime is 191978131. The reversal of 191978130 is 31879191.

191978130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (191978131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18270 + ... + 26790.

It is an arithmetic number, because the mean of its divisors is an integer number (14419224).

Almost surely, 2^191978130 is an apocalyptic number.

191978130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

191978130 is an abundant number, since it is smaller than the sum of its proper divisors (269437038).

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

191978130 is a wasteful number, since it uses less digits than its factorization.

191978130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 191978130 is about 13855.6172724278. The cubic root of 191978130 is about 576.8779231259.

The spelling of 191978130 in words is "one hundred ninety-one million, nine hundred seventy-eight thousand, one hundred thirty".