978389 has 2 divisors, whose sum is σ = 978390. Its totient is φ = 978388.

The previous prime is 978359. The next prime is 978403. The reversal of 978389 is 983879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966289 + 12100 = 983^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 978389 - 2¹² = 974293 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (978349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489194 + 489195.

It is an arithmetic number, because the mean of its divisors is an integer number (489195).

2⁹⁷⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

978389 is a deficient number, since it is larger than the sum of its proper divisors (1).

978389 is an equidigital number, since it uses as much as digits as its factorization.

978389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 978389 is about 989.1354811147. The cubic root of 978389 is about 99.2743808368.

The spelling of 978389 in words is "nine hundred seventy-eight thousand, three hundred eighty-nine".