2381991986 has 8 divisors (see below), whose sum is σ = 3897805104. Its totient is φ = 1082723620.

The previous prime is 2381991967. The next prime is 2381992003. The reversal of 2381991986 is 6891991832.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54136160 + ... + 54136203.

It is an arithmetic number, because the mean of its divisors is an integer number (487225638).

Almost surely, 2^2381991986 is an apocalyptic number.

2381991986 is a deficient number, since it is larger than the sum of its proper divisors (1515813118).

2381991986 is a wasteful number, since it uses less digits than its factorization.

2381991986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108272376.

The product of its digits is 1679616, while the sum is 56.

The square root of 2381991986 is about 48805.6552665775. The cubic root of 2381991986 is about 1335.5088347286.

The spelling of 2381991986 in words is "two billion, three hundred eighty-one million, nine hundred ninety-one thousand, nine hundred eighty-six".