939881 has 2 divisors, whose sum is σ = 939882. Its totient is φ = 939880.

The previous prime is 939871. The next prime is 939901. The reversal of 939881 is 188939.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 477481 + 462400 = 691^2 + 680^2 .

It is an emirp because it is prime and its reverse (188939) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 939881 - 2¹⁰ = 938857 is a prime.

It is a super-2 number, since 2×939881² = 1766752588322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (939871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469940 + 469941.

It is an arithmetic number, because the mean of its divisors is an integer number (469941).

2⁹³⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

939881 is a deficient number, since it is larger than the sum of its proper divisors (1).

939881 is an equidigital number, since it uses as much as digits as its factorization.

939881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 939881 is about 969.4745999767. The cubic root of 939881 is about 97.9544769827.

The spelling of 939881 in words is "nine hundred thirty-nine thousand, eight hundred eighty-one".