1976864189 has 2 divisors, whose sum is σ = 1976864190. Its totient is φ = 1976864188.

The previous prime is 1976864137. The next prime is 1976864251. The reversal of 1976864189 is 9814686791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1936440025 + 40424164 = 44005^2 + 6358^2 .

It is a cyclic number.

It is not a de Polignac number, because 1976864189 - 2²⁰ = 1975815613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1976864689) 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, 988432094 + 988432095.

It is an arithmetic number, because the mean of its divisors is an integer number (988432095).

Almost surely, 2^1976864189 is an apocalyptic number.

It is an amenable number.

1976864189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1976864189 is an equidigital number, since it uses as much as digits as its factorization.

1976864189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The square root of 1976864189 is about 44461.9409045534. The cubic root of 1976864189 is about 1255.0439795596.

The spelling of 1976864189 in words is "one billion, nine hundred seventy-six million, eight hundred sixty-four thousand, one hundred eighty-nine".