8278389 has 16 divisors (see below), whose sum is σ = 14016640. Its totient is φ = 4730400.

The previous prime is 8278373. The next prime is 8278393. The reversal of 8278389 is 9838728.

It is not a de Polignac number, because 8278389 - 2⁴ = 8278373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21712 + ... + 22089.

It is an arithmetic number, because the mean of its divisors is an integer number (876040).

Almost surely, 2^8278389 is an apocalyptic number.

It is an amenable number.

8278389 is a deficient number, since it is larger than the sum of its proper divisors (5738251).

8278389 is a wasteful number, since it uses less digits than its factorization.

8278389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43817 (or 43811 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 8278389 is about 2877.2189697692. The cubic root of 8278389 is about 202.2935069278.

It can be divided in two parts, 827 and 8389, that added together give a square (9216 = 96²).

The spelling of 8278389 in words is "eight million, two hundred seventy-eight thousand, three hundred eighty-nine".