8978449 has 2 divisors, whose sum is σ = 8978450. Its totient is φ = 8978448.

The previous prime is 8978381. The next prime is 8978471. The reversal of 8978449 is 9448798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7398400 + 1580049 = 2720^2 + 1257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8978449 is a prime.

It is a super-2 number, since 2×8978449² = 161225092891202, which contains 22 as substring.

It is a Chen prime.

It is a d-powerful number, because it can be written as 8³ + 9² + 7 + 8³ + 4³ + 4¹¹ + 9⁷ .

8978449 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8978479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489224 + 4489225.

It is an arithmetic number, because the mean of its divisors is an integer number (4489225).

Almost surely, 2^8978449 is an apocalyptic number.

It is an amenable number.

8978449 is a deficient number, since it is larger than the sum of its proper divisors (1).

8978449 is an equidigital number, since it uses as much as digits as its factorization.

8978449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 8978449 is about 2996.4060138773. The cubic root of 8978449 is about 207.8422203974.

The spelling of 8978449 in words is "eight million, nine hundred seventy-eight thousand, four hundred forty-nine".