1983997 has 2 divisors, whose sum is σ = 1983998. Its totient is φ = 1983996.

The previous prime is 1983979. The next prime is 1984007. The reversal of 1983997 is 7993891.

Together with previous prime (1983979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1920996 + 63001 = 1386^2 + 251^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983997 - 2¹¹ = 1981949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991998 + 991999.

It is an arithmetic number, because the mean of its divisors is an integer number (991999).

2^1983997 is an apocalyptic number.

It is an amenable number.

1983997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983997 is an equidigital number, since it uses as much as digits as its factorization.

1983997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 1983997 is about 1408.5442840039. The cubic root of 1983997 is about 125.6551627613.

The spelling of 1983997 in words is "one million, nine hundred eighty-three thousand, nine hundred ninety-seven".