438639 has 4 divisors (see below), whose sum is σ = 584856. Its totient is φ = 292424.

The previous prime is 438637. The next prime is 438661. The reversal of 438639 is 936834.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 438639 - 2¹ = 438637 is a prime.

It is a super-3 number, since 3×438639³ = 253187921228133357, which contains 333 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438631) 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, 73104 + ... + 73109.

It is an arithmetic number, because the mean of its divisors is an integer number (146214).

2⁴³⁸⁶³⁹ is an apocalyptic number.

438639 is a deficient number, since it is larger than the sum of its proper divisors (146217).

438639 is a wasteful number, since it uses less digits than its factorization.

438639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146216.

The product of its digits is 15552, while the sum is 33.

The square root of 438639 is about 662.2982711739. The cubic root of 438639 is about 75.9805467293.

The spelling of 438639 in words is "four hundred thirty-eight thousand, six hundred thirty-nine".