881639 has 4 divisors (see below), whose sum is σ = 961800. Its totient is φ = 801480.

The previous prime is 881611. The next prime is 881641. The reversal of 881639 is 936188.

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 881639 - 2¹² = 877543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 881599 and 881608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881669) 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, 40064 + ... + 40085.

It is an arithmetic number, because the mean of its divisors is an integer number (240450).

2⁸⁸¹⁶³⁹ is an apocalyptic number.

881639 is a deficient number, since it is larger than the sum of its proper divisors (80161).

881639 is a wasteful number, since it uses less digits than its factorization.

881639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80160.

The product of its digits is 10368, while the sum is 35.

The square root of 881639 is about 938.9563355130. The cubic root of 881639 is about 95.8878537071.

The spelling of 881639 in words is "eight hundred eighty-one thousand, six hundred thirty-nine".