1980899 has 2 divisors, whose sum is σ = 1980900. Its totient is φ = 1980898.

The previous prime is 1980877. The next prime is 1980907. The reversal of 1980899 is 9980891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1980899 - 2¹² = 1976803 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (1980809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990449 + 990450.

It is an arithmetic number, because the mean of its divisors is an integer number (990450).

2^1980899 is an apocalyptic number.

1980899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980899 is an equidigital number, since it uses as much as digits as its factorization.

1980899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1980899 is about 1407.4441374349. Note that the first 3 decimals coincide. The cubic root of 1980899 is about 125.5897254162.

The spelling of 1980899 in words is "one million, nine hundred eighty thousand, eight hundred ninety-nine".