1971917972 has 12 divisors (see below), whose sum is σ = 3600893856. Its totient is φ = 943091160.

The previous prime is 1971917971. The next prime is 1971917977. The reversal of 1971917972 is 2797191791.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971917971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10716854 + ... + 10717037.

It is an arithmetic number, because the mean of its divisors is an integer number (300074488).

Almost surely, 2^1971917972 is an apocalyptic number.

It is an amenable number.

1971917972 is a deficient number, since it is larger than the sum of its proper divisors (1628975884).

1971917972 is a wasteful number, since it uses less digits than its factorization.

1971917972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21433918 (or 21433916 counting only the distinct ones).

The product of its digits is 500094, while the sum is 53.

The square root of 1971917972 is about 44406.2830239145. The cubic root of 1971917972 is about 1253.9963769209.

The spelling of 1971917972 in words is "one billion, nine hundred seventy-one million, nine hundred seventeen thousand, nine hundred seventy-two".