191420928 has 160 divisors (see below), whose sum is σ = 578445120. Its totient is φ = 62484480.

The previous prime is 191420903. The next prime is 191420963. The reversal of 191420928 is 829024191.

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

It is a junction number, because it is equal to n+sod(n) for n = 191420892 and 191420901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843151 + ... + 843377.

It is an arithmetic number, because the mean of its divisors is an integer number (3615282).

Almost surely, 2^191420928 is an apocalyptic number.

191420928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191420928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289222560).

191420928 is an abundant number, since it is smaller than the sum of its proper divisors (387024192).

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

191420928 is an equidigital number, since it uses as much as digits as its factorization.

191420928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 191420928 is about 13835.4952206273. The cubic root of 191420928 is about 576.3192674470.

The spelling of 191420928 in words is "one hundred ninety-one million, four hundred twenty thousand, nine hundred twenty-eight".