1985976671 has 4 divisors (see below), whose sum is σ = 2269687632. Its totient is φ = 1702265712.

The previous prime is 1985976667. The next prime is 1985976673. The reversal of 1985976671 is 1766795891.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1985976671 - 2² = 1985976667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1985976671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985976673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141855470 + ... + 141855483.

It is an arithmetic number, because the mean of its divisors is an integer number (567421908).

Almost surely, 2^1985976671 is an apocalyptic number.

1985976671 is a deficient number, since it is larger than the sum of its proper divisors (283710961).

1985976671 is an equidigital number, since it uses as much as digits as its factorization.

1985976671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283710960.

The product of its digits is 5715360, while the sum is 59.

The square root of 1985976671 is about 44564.2981656842. The cubic root of 1985976671 is about 1256.9694259429.

The spelling of 1985976671 in words is "one billion, nine hundred eighty-five million, nine hundred seventy-six thousand, six hundred seventy-one".