8428389 has 8 divisors (see below), whose sum is σ = 11364480. Its totient is φ = 5555616.

The previous prime is 8428363. The next prime is 8428391. The reversal of 8428389 is 9838248.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8428389 - 2¹² = 8424293 is a prime.

It is a super-2 number, since 2×8428389² = 142075482270642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 8428389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8428319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15517 + ... + 16050.

It is an arithmetic number, because the mean of its divisors is an integer number (1420560).

Almost surely, 2^8428389 is an apocalyptic number.

8428389 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

8428389 is a deficient number, since it is larger than the sum of its proper divisors (2936091).

8428389 is a wasteful number, since it uses less digits than its factorization.

8428389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31659.

The product of its digits is 110592, while the sum is 42.

The square root of 8428389 is about 2903.1687859992. The cubic root of 8428389 is about 203.5080176418.

The spelling of 8428389 in words is "eight million, four hundred twenty-eight thousand, three hundred eighty-nine".