1971686764 has 24 divisors (see below), whose sum is σ = 3480523200. Its totient is φ = 977268240.

The previous prime is 1971686749. The next prime is 1971686767. The reversal of 1971686764 is 4676861791.

It is not an unprimeable number, because it can be changed into a prime (1971686767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 763227 + ... + 765805.

It is an arithmetic number, because the mean of its divisors is an integer number (145021800).

Almost surely, 2^1971686764 is an apocalyptic number.

It is an amenable number.

1971686764 is a deficient number, since it is larger than the sum of its proper divisors (1508836436).

1971686764 is a wasteful number, since it uses less digits than its factorization.

1971686764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173 (or 4171 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 55.

The square root of 1971686764 is about 44403.6796223016. The cubic root of 1971686764 is about 1253.9473645160.

The spelling of 1971686764 in words is "one billion, nine hundred seventy-one million, six hundred eighty-six thousand, seven hundred sixty-four".