6408989 has 4 divisors (see below), whose sum is σ = 6414240. Its totient is φ = 6403740.

The previous prime is 6408977. The next prime is 6408991. The reversal of 6408989 is 9898046.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6408989 - 2¹⁶ = 6343453 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 (6408929) 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, 272 + ... + 3590.

It is an arithmetic number, because the mean of its divisors is an integer number (1603560).

Almost surely, 2^6408989 is an apocalyptic number.

It is an amenable number.

6408989 is a deficient number, since it is larger than the sum of its proper divisors (5251).

6408989 is a wasteful number, since it uses less digits than its factorization.

6408989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 6408989 is about 2531.5981118653. The cubic root of 6408989 is about 185.7504361016.

The spelling of 6408989 in words is "six million, four hundred eight thousand, nine hundred eighty-nine".