939681 has 14 divisors (see below), whose sum is σ = 1409970. Its totient is φ = 625968.

The previous prime is 939677. The next prime is 939707. The reversal of 939681 is 186939.

939681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 46656 = 945^2 + 216^2 .

It is not a de Polignac number, because 939681 - 2² = 939677 is a prime.

It is a super-2 number, since 2×939681² = 1766000763522, which contains 22 as substring.

It is a Curzon number.

939681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (939611) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 85 + ... + 1373.

2⁹³⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

939681 is a deficient number, since it is larger than the sum of its proper divisors (470289).

939681 is an equidigital number, since it uses as much as digits as its factorization.

939681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1292 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 939681 is about 969.3714458349. The cubic root of 939681 is about 97.9475284842.

The spelling of 939681 in words is "nine hundred thirty-nine thousand, six hundred eighty-one".