1983649 has 2 divisors, whose sum is σ = 1983650. Its totient is φ = 1983648.

The previous prime is 1983647. The next prime is 1983689. The reversal of 1983649 is 9463891.

It is an a-pointer prime, because the next prime (1983689) can be obtained adding 1983649 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1871424 + 112225 = 1368^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983649 - 2¹ = 1983647 is a prime.

Together with 1983647, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1983643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991824 + 991825.

It is an arithmetic number, because the mean of its divisors is an integer number (991825).

2^1983649 is an apocalyptic number.

It is an amenable number.

1983649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983649 is an equidigital number, since it uses as much as digits as its factorization.

1983649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 1983649 is about 1408.4207467941. The cubic root of 1983649 is about 125.6478155470.

The spelling of 1983649 in words is "one million, nine hundred eighty-three thousand, six hundred forty-nine".