1973689 has 2 divisors, whose sum is σ = 1973690. Its totient is φ = 1973688.

The previous prime is 1973687. The next prime is 1973723. The reversal of 1973689 is 9863791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 13689 = 1400^2 + 117^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973689 - 2¹ = 1973687 is a prime.

Together with 1973687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1973687) 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, 986844 + 986845.

It is an arithmetic number, because the mean of its divisors is an integer number (986845).

2^1973689 is an apocalyptic number.

It is an amenable number.

1973689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973689 is an equidigital number, since it uses as much as digits as its factorization.

1973689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 1973689 is about 1404.8804219577. The cubic root of 1973689 is about 125.4371679577.

It can be divided in two parts, 1973 and 689, that added together give a palindrome (2662).

The spelling of 1973689 in words is "one million, nine hundred seventy-three thousand, six hundred eighty-nine".