1971756012 has 24 divisors (see below), whose sum is σ = 4617874800. Its totient is φ = 654807616.

The previous prime is 1971756001. The next prime is 1971756019. The reversal of 1971756012 is 2106571791.

It is not an unprimeable number, because it can be changed into a prime (1971756019) 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, 302187 + ... + 308642.

It is an arithmetic number, because the mean of its divisors is an integer number (192411450).

Almost surely, 2^1971756012 is an apocalyptic number.

1971756012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1971756012 is an abundant number, since it is smaller than the sum of its proper divisors (2646118788).

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

1971756012 is a wasteful number, since it uses less digits than its factorization.

1971756012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611105 (or 611103 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 39.

The square root of 1971756012 is about 44404.4593706533. The cubic root of 1971756012 is about 1253.9620443884.

The spelling of 1971756012 in words is "one billion, nine hundred seventy-one million, seven hundred fifty-six thousand, twelve".