1979729 has 2 divisors, whose sum is σ = 1979730. Its totient is φ = 1979728.

The previous prime is 1979723. The next prime is 1979741. The reversal of 1979729 is 9279791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1918225 + 61504 = 1385^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979729 - 2⁴ = 1979713 is a prime.

It is a super-4 number, since 4×1979729⁴ (a number of 26 digits) contains 4444 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1979729.

It is not a weakly prime, because it can be changed into another prime (1979723) 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, 989864 + 989865.

It is an arithmetic number, because the mean of its divisors is an integer number (989865).

2^1979729 is an apocalyptic number.

It is an amenable number.

1979729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979729 is an equidigital number, since it uses as much as digits as its factorization.

1979729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 44.

The square root of 1979729 is about 1407.0284289950. The cubic root of 1979729 is about 125.5649944030.

The spelling of 1979729 in words is "one million, nine hundred seventy-nine thousand, seven hundred twenty-nine".