1984729 has 2 divisors, whose sum is σ = 1984730. Its totient is φ = 1984728.

The previous prime is 1984727. The next prime is 1984747. The reversal of 1984729 is 9274891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1265625 + 719104 = 1125^2 + 848^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984729 - 2¹ = 1984727 is a prime.

Together with 1984727, it forms a pair of twin primes.

It is an Ulam number.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 1984691 and 1984700.

It is not a weakly prime, because it can be changed into another prime (1984727) 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, 992364 + 992365.

It is an arithmetic number, because the mean of its divisors is an integer number (992365).

2^1984729 is an apocalyptic number.

It is an amenable number.

1984729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984729 is an equidigital number, since it uses as much as digits as its factorization.

1984729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 1984729 is about 1408.8041027765. The cubic root of 1984729 is about 125.6706144429.

It can be divided in two parts, 19 and 84729, that added together give a palindrome (84748).

The spelling of 1984729 in words is "one million, nine hundred eighty-four thousand, seven hundred twenty-nine".