191197440 has 216 divisors, whose sum is σ = 756345408. Its totient is φ = 43683840.

The previous prime is 191197427. The next prime is 191197441. The reversal of 191197440 is 44791191.

It is a super-2 number, since 2×191197440² = 73112922125107200, which contains 22 as substring.

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 = 191197395 and 191197404.

It is not an unprimeable number, because it can be changed into a prime (191197441) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 79455 + ... + 81825.

Almost surely, 2^191197440 is an apocalyptic number.

191197440 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 191197440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378172704).

191197440 is an abundant number, since it is smaller than the sum of its proper divisors (565147968).

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

191197440 is a wasteful number, since it uses less digits than its factorization.

191197440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 191197440 is about 13827.4162445484. The cubic root of 191197440 is about 576.0948917738.

The spelling of 191197440 in words is "one hundred ninety-one million, one hundred ninety-seven thousand, four hundred forty".