1977863 has 2 divisors, whose sum is σ = 1977864. Its totient is φ = 1977862.

The previous prime is 1977827. The next prime is 1977917. The reversal of 1977863 is 3687791.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1977863 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1977863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988931 + 988932.

It is an arithmetic number, because the mean of its divisors is an integer number (988932).

2^1977863 is an apocalyptic number.

1977863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977863 is an equidigital number, since it uses as much as digits as its factorization.

1977863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 1977863 is about 1406.3651730614. The cubic root of 1977863 is about 125.5255314373.

The spelling of 1977863 in words is "one million, nine hundred seventy-seven thousand, eight hundred sixty-three".