1977316216 has 8 divisors (see below), whose sum is σ = 3707467920. Its totient is φ = 988658104.

The previous prime is 1977316199. The next prime is 1977316217. The reversal of 1977316216 is 6126137791.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977316217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123582256 + ... + 123582271.

It is an arithmetic number, because the mean of its divisors is an integer number (463433490).

Almost surely, 2^1977316216 is an apocalyptic number.

It is an amenable number.

1977316216 is a deficient number, since it is larger than the sum of its proper divisors (1730151704).

1977316216 is a wasteful number, since it uses less digits than its factorization.

1977316216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247164533 (or 247164529 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 1977316216 is about 44467.0239166059. The cubic root of 1977316216 is about 1255.1396311364.

The spelling of 1977316216 in words is "one billion, nine hundred seventy-seven million, three hundred sixteen thousand, two hundred sixteen".