191039646 has 64 divisors (see below), whose sum is σ = 458657280. Its totient is φ = 51891840.

The previous prime is 191039627. The next prime is 191039647. The reversal of 191039646 is 646930191.

It is a super-2 number, since 2×191039646² = 72992292687610632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191039647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80436 + ... + 82776.

It is an arithmetic number, because the mean of its divisors is an integer number (7166520).

Almost surely, 2^191039646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191039646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229328640).

191039646 is an abundant number, since it is smaller than the sum of its proper divisors (267617634).

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

191039646 is a wasteful number, since it uses less digits than its factorization.

191039646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 191039646 is about 13821.7092286012. The cubic root of 191039646 is about 575.9363657036.

The spelling of 191039646 in words is "one hundred ninety-one million, thirty-nine thousand, six hundred forty-six".