191151440 has 40 divisors (see below), whose sum is σ = 446697600. Its totient is φ = 76070016.

The previous prime is 191151439. The next prime is 191151461. The reversal of 191151440 is 44151191.

191151440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9917 + ... + 21923.

It is an arithmetic number, because the mean of its divisors is an integer number (11167440).

Almost surely, 2^191151440 is an apocalyptic number.

191151440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191151440 is an abundant number, since it is smaller than the sum of its proper divisors (255546160).

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

191151440 is a wasteful number, since it uses less digits than its factorization.

191151440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12219 (or 12213 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 191151440 is about 13825.7527823985. The cubic root of 191151440 is about 576.0486873711.

The spelling of 191151440 in words is "one hundred ninety-one million, one hundred fifty-one thousand, four hundred forty".