191543940 has 360 divisors, whose sum is σ = 741565440. Its totient is φ = 41150592.

The previous prime is 191543939. The next prime is 191543971. The reversal of 191543940 is 49345191.

It is a happy number.

191543940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 191543895 and 191543904.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1508157 + ... + 1508283.

It is an arithmetic number, because the mean of its divisors is an integer number (2059904).

Almost surely, 2^191543940 is an apocalyptic number.

191543940 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 191543940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370782720).

191543940 is an abundant number, since it is smaller than the sum of its proper divisors (550021500).

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

191543940 is a wasteful number, since it uses less digits than its factorization.

191543940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 191543940 is about 13839.9400287718. The cubic root of 191543940 is about 576.4426935282.

The spelling of 191543940 in words is "one hundred ninety-one million, five hundred forty-three thousand, nine hundred forty".