988639 has 8 divisors (see below), whose sum is σ = 1038960. Its totient is φ = 939456.

The previous prime is 988607. The next prime is 988643. The reversal of 988639 is 936889.

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

It is a cyclic number.

It is not a de Polignac number, because 988639 - 2⁵ = 988607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 988595 and 988604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988649) 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, 1884 + ... + 2350.

It is an arithmetic number, because the mean of its divisors is an integer number (129870).

2⁹⁸⁸⁶³⁹ is an apocalyptic number.

988639 is a deficient number, since it is larger than the sum of its proper divisors (50321).

988639 is a wasteful number, since it uses less digits than its factorization.

988639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569.

The product of its digits is 93312, while the sum is 43.

The square root of 988639 is about 994.3032736545. The cubic root of 988639 is about 99.6198567422.

The spelling of 988639 in words is "nine hundred eighty-eight thousand, six hundred thirty-nine".