8478989 has 2 divisors, whose sum is σ = 8478990. Its totient is φ = 8478988.

The previous prime is 8478961. The next prime is 8479007. The reversal of 8478989 is 9898748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4656964 + 3822025 = 2158^2 + 1955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8478989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8478989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8478929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4239494 + 4239495.

It is an arithmetic number, because the mean of its divisors is an integer number (4239495).

Almost surely, 2^8478989 is an apocalyptic number.

It is an amenable number.

8478989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8478989 is an equidigital number, since it uses as much as digits as its factorization.

8478989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 53.

The square root of 8478989 is about 2911.8703611253. The cubic root of 8478989 is about 203.9144601642.

The spelling of 8478989 in words is "eight million, four hundred seventy-eight thousand, nine hundred eighty-nine".