6423989 has 16 divisors (see below), whose sum is σ = 7620480. Its totient is φ = 5338560.

The previous prime is 6423953. The next prime is 6423997. The reversal of 6423989 is 9893246.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6423989 - 2⁸ = 6423733 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁴ + 4¹¹ + 2¹⁷ + 3 + 9² + 8⁷ + 9² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6423929) 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, 23747 + ... + 24015.

It is an arithmetic number, because the mean of its divisors is an integer number (476280).

Almost surely, 2^6423989 is an apocalyptic number.

It is an amenable number.

6423989 is a deficient number, since it is larger than the sum of its proper divisors (1196491).

6423989 is a wasteful number, since it uses less digits than its factorization.

6423989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460.

The product of its digits is 93312, while the sum is 41.

The square root of 6423989 is about 2534.5589359887. The cubic root of 6423989 is about 185.8952371850.

It can be divided in two parts, 64239 and 89, that multiplied together give a triangular number (5717271 = T₃₃₈₁).

The spelling of 6423989 in words is "six million, four hundred twenty-three thousand, nine hundred eighty-nine".