1977995983 has 2 divisors, whose sum is σ = 1977995984. Its totient is φ = 1977995982.

The previous prime is 1977995963. The next prime is 1977995989. The reversal of 1977995983 is 3895997791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1977995983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977995989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988997991 + 988997992.

It is an arithmetic number, because the mean of its divisors is an integer number (988997992).

Almost surely, 2^1977995983 is an apocalyptic number.

1977995983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977995983 is an equidigital number, since it uses as much as digits as its factorization.

1977995983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38578680, while the sum is 67.

The square root of 1977995983 is about 44474.6667553564. Note that the first 3 decimals coincide. The cubic root of 1977995983 is about 1255.2834463982.

The spelling of 1977995983 in words is "one billion, nine hundred seventy-seven million, nine hundred ninety-five thousand, nine hundred eighty-three".