8420889 has 4 divisors (see below), whose sum is σ = 11227856. Its totient is φ = 5613924.

The previous prime is 8420887. The next prime is 8420891. The reversal of 8420889 is 9880248.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8420887) and next prime (8420891).

It is not a de Polignac number, because 8420889 - 2¹ = 8420887 is a prime.

It is a super-2 number, since 2×8420889² = 141822743100642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403479 + ... + 1403484.

It is an arithmetic number, because the mean of its divisors is an integer number (2806964).

Almost surely, 2^8420889 is an apocalyptic number.

It is an amenable number.

8420889 is a deficient number, since it is larger than the sum of its proper divisors (2806967).

8420889 is a wasteful number, since it uses less digits than its factorization.

8420889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806966.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 8420889 is about 2901.8768064823. The cubic root of 8420889 is about 203.4476358739.

The spelling of 8420889 in words is "eight million, four hundred twenty thousand, eight hundred eighty-nine".