1978480277 has 2 divisors, whose sum is σ = 1978480278. Its totient is φ = 1978480276.

The previous prime is 1978480261. The next prime is 1978480289. The reversal of 1978480277 is 7720848791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230676561 + 747803716 = 35081^2 + 27346^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978480277 - 2⁴ = 1978480261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978480177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989240138 + 989240139.

It is an arithmetic number, because the mean of its divisors is an integer number (989240139).

Almost surely, 2^1978480277 is an apocalyptic number.

It is an amenable number.

1978480277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978480277 is an equidigital number, since it uses as much as digits as its factorization.

1978480277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The square root of 1978480277 is about 44480.1110272895. Note that the first 3 decimals coincide. The cubic root of 1978480277 is about 1255.3858862141.

The spelling of 1978480277 in words is "one billion, nine hundred seventy-eight million, four hundred eighty thousand, two hundred seventy-seven".