1977322809 has 32 divisors (see below), whose sum is σ = 3375830016. Its totient is φ = 999414720.

The previous prime is 1977322783. The next prime is 1977322829. The reversal of 1977322809 is 9082237791.

It is not a de Polignac number, because 1977322809 - 2⁸ = 1977322553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1977322829) 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 in 31 ways as a sum of consecutive naturals, for example, 107127 + ... + 124220.

It is an arithmetic number, because the mean of its divisors is an integer number (105494688).

Almost surely, 2^1977322809 is an apocalyptic number.

It is an amenable number.

1977322809 is a deficient number, since it is larger than the sum of its proper divisors (1398507207).

1977322809 is a wasteful number, since it uses less digits than its factorization.

1977322809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231405.

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 1977322809 is about 44467.0980501314. The cubic root of 1977322809 is about 1255.1410261461.

The spelling of 1977322809 in words is "one billion, nine hundred seventy-seven million, three hundred twenty-two thousand, eight hundred nine".