191894040 has 192 divisors, whose sum is σ = 678918240. Its totient is φ = 46725120.

The previous prime is 191894029. The next prime is 191894077. The reversal of 191894040 is 40498191.

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 = 191893986 and 191894004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 612924 + ... + 613236.

Almost surely, 2^191894040 is an apocalyptic number.

191894040 is a gapful number since it is divisible by the number (10) 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 191894040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339459120).

191894040 is an abundant number, since it is smaller than the sum of its proper divisors (487024200).

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

191894040 is a wasteful number, since it uses less digits than its factorization.

191894040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 467 counting only the distinct ones).

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

The square root of 191894040 is about 13852.5824307239. The cubic root of 191894040 is about 576.7936830634.

The spelling of 191894040 in words is "one hundred ninety-one million, eight hundred ninety-four thousand, forty".