784489 has 2 divisors, whose sum is σ = 784490. Its totient is φ = 784488.

The previous prime is 784481. The next prime is 784501. The reversal of 784489 is 984487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514089 + 270400 = 717^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 784489 - 2³ = 784481 is a prime.

It is a super-2 number, since 2×784489² = 1230845982242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (784481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392244 + 392245.

It is an arithmetic number, because the mean of its divisors is an integer number (392245).

2⁷⁸⁴⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

784489 is a deficient number, since it is larger than the sum of its proper divisors (1).

784489 is an equidigital number, since it uses as much as digits as its factorization.

784489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 784489 is about 885.7138364054. The cubic root of 784489 is about 92.2278928036.

The spelling of 784489 in words is "seven hundred eighty-four thousand, four hundred eighty-nine".