191894464 has 42 divisors (see below), whose sum is σ = 394342112. Its totient is φ = 92553600.

The previous prime is 191894431. The next prime is 191894489. The reversal of 191894464 is 464498191.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 616869 + ... + 617179.

Almost surely, 2^191894464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191894464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197171056).

191894464 is an abundant number, since it is smaller than the sum of its proper divisors (202447648).

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

191894464 is an frugal number, since it uses more digits than its factorization.

191894464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 344 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 191894464 is about 13852.5977347211. The cubic root of 191894464 is about 576.7941078818.

It can be divided in two parts, 19189 and 4464, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 191894464 in words is "one hundred ninety-one million, eight hundred ninety-four thousand, four hundred sixty-four".