191201398840 has 16 divisors (see below), whose sum is σ = 430203147480. Its totient is φ = 76480559520.

The previous prime is 191201398799. The next prime is 191201398963. The reversal of 191201398840 is 48893102191.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2390017446 + ... + 2390017525.

Almost surely, 2^191201398840 is an apocalyptic number.

191201398840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191201398840 is an abundant number, since it is smaller than the sum of its proper divisors (239001748640).

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

191201398840 is a wasteful number, since it uses less digits than its factorization.

191201398840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780034982 (or 4780034978 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 191201398840 in words is "one hundred ninety-one billion, two hundred one million, three hundred ninety-eight thousand, eight hundred forty".