191856440 has 16 divisors (see below), whose sum is σ = 431677080. Its totient is φ = 76742560.

The previous prime is 191856439. The next prime is 191856451. The reversal of 191856440 is 44658191.

It is a junction number, because it is equal to n+sod(n) for n = 191856394 and 191856403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2398166 + ... + 2398245.

Almost surely, 2^191856440 is an apocalyptic number.

191856440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191856440 is an abundant number, since it is smaller than the sum of its proper divisors (239820640).

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

191856440 is a wasteful number, since it uses less digits than its factorization.

191856440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4796422 (or 4796418 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 191856440 is about 13851.2252165648. The cubic root of 191856440 is about 576.7560080022.

The spelling of 191856440 in words is "one hundred ninety-one million, eight hundred fifty-six thousand, four hundred forty".