984391 has 2 divisors, whose sum is σ = 984392.
Its totient is φ = 984390.
The previous prime is 984383. The next prime is 984397. The reversal of 984391 is 193489.
It can be divided in two parts, 98 and 4391, that added together give a square (4489 = 672).
984391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 984391 - 23 = 984383 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (984397) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492195 + 492196.
It is an arithmetic number, because the mean of its divisors is an integer number (492196).
2984391 is an apocalyptic number.
984391 is the 628-th centered pentagonal number.
984391 is a deficient number, since it is larger than the sum of its proper divisors (1).
984391 is an equidigital number, since it uses as much as digits as its factorization.
984391 is an evil number, because the sum of its binary digits is even.
The product of its digits is 7776, while the sum is 34.
The square root of 984391 is about 992.1648048585.
The cubic root of 984391 is about 99.4769691567.
The spelling of 984391 in words is "nine hundred eighty-four thousand, three hundred ninety-one".