191220042 has 16 divisors (see below), whose sum is σ = 411858720. Its totient is φ = 58836912.

The previous prime is 191220037. The next prime is 191220049. The reversal of 191220042 is 240022191.

191220042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (191220049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1225692 + ... + 1225847.

It is an arithmetic number, because the mean of its divisors is an integer number (25741170).

Almost surely, 2^191220042 is an apocalyptic number.

191220042 is an abundant number, since it is smaller than the sum of its proper divisors (220638678).

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

191220042 is a wasteful number, since it uses less digits than its factorization.

191220042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451557.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 191220042 is about 13828.2335097438. The cubic root of 191220042 is about 576.1175914915.

The spelling of 191220042 in words is "one hundred ninety-one million, two hundred twenty thousand, forty-two".