2019977 has 2 divisors, whose sum is σ = 2019978. Its totient is φ = 2019976.

The previous prime is 2019973. The next prime is 2020001. The reversal of 2019977 is 7799102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1901641 + 118336 = 1379^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 2019977 - 2² = 2019973 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2019973) 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, 1009988 + 1009989.

It is an arithmetic number, because the mean of its divisors is an integer number (1009989).

2^2019977 is an apocalyptic number.

It is an amenable number.

2019977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2019977 is an equidigital number, since it uses as much as digits as its factorization.

2019977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 2019977 is about 1421.2589489604. The cubic root of 2019977 is about 126.4102067080.

The spelling of 2019977 in words is "two million, nineteen thousand, nine hundred seventy-seven".