743989 has 2 divisors, whose sum is σ = 743990. Its totient is φ = 743988.

The previous prime is 743987. The next prime is 744019. The reversal of 743989 is 989347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 321489 = 650^2 + 567^2 .

It is an emirp because it is prime and its reverse (989347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 743989 - 2¹ = 743987 is a prime.

Together with 743987, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (743987) 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, 371994 + 371995.

It is an arithmetic number, because the mean of its divisors is an integer number (371995).

2⁷⁴³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

743989 is a deficient number, since it is larger than the sum of its proper divisors (1).

743989 is an equidigital number, since it uses as much as digits as its factorization.

743989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 743989 is about 862.5479696805. The cubic root of 743989 is about 90.6126513495.

The spelling of 743989 in words is "seven hundred forty-three thousand, nine hundred eighty-nine".