6437989 has 4 divisors (see below), whose sum is σ = 6473740. Its totient is φ = 6402240.

The previous prime is 6437983. The next prime is 6438007. The reversal of 6437989 is 9897346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9897346 = 2 ⋅4948673.

It can be written as a sum of positive squares in 2 ways, for example, as 3045025 + 3392964 = 1745^2 + 1842^2 .

It is a cyclic number.

It is not a de Polignac number, because 6437989 - 2⁵ = 6437957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6437983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17604 + ... + 17965.

It is an arithmetic number, because the mean of its divisors is an integer number (1618435).

Almost surely, 2^6437989 is an apocalyptic number.

It is an amenable number.

6437989 is a deficient number, since it is larger than the sum of its proper divisors (35751).

6437989 is a wasteful number, since it uses less digits than its factorization.

6437989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35750.

The product of its digits is 326592, while the sum is 46.

The square root of 6437989 is about 2537.3192546465. The cubic root of 6437989 is about 186.0301816363.

The spelling of 6437989 in words is "six million, four hundred thirty-seven thousand, nine hundred eighty-nine".