637989 has 8 divisors (see below), whose sum is σ = 928032. Its totient is φ = 386640.

The previous prime is 637939. The next prime is 638023. The reversal of 637989 is 989736.

It is a happy number.

637989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 637989 - 2¹⁵ = 605221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 637989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637909) 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, 9634 + ... + 9699.

It is an arithmetic number, because the mean of its divisors is an integer number (116004).

2⁶³⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

637989 is a deficient number, since it is larger than the sum of its proper divisors (290043).

637989 is a wasteful number, since it uses less digits than its factorization.

637989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19347.

The product of its digits is 81648, while the sum is 42.

The square root of 637989 is about 798.7421361115. The cubic root of 637989 is about 86.0870310593.

The spelling of 637989 in words is "six hundred thirty-seven thousand, nine hundred eighty-nine".