939705681 has 4 divisors (see below), whose sum is σ = 1252940912. Its totient is φ = 626470452.

The previous prime is 939705653. The next prime is 939705709. The reversal of 939705681 is 186507939.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186507939 = 3 ⋅62169313.

It is an interprime number because it is at equal distance from previous prime (939705653) and next prime (939705709).

It is not a de Polignac number, because 939705681 - 2¹⁰ = 939704657 is a prime.

It is a super-2 number, since 2×939705681² = 1766093533807347522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 939705681.

It is not an unprimeable number, because it can be changed into a prime (939705631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156617611 + ... + 156617616.

It is an arithmetic number, because the mean of its divisors is an integer number (313235228).

Almost surely, 2^939705681 is an apocalyptic number.

It is an amenable number.

939705681 is a deficient number, since it is larger than the sum of its proper divisors (313235231).

939705681 is a wasteful number, since it uses less digits than its factorization.

939705681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313235230.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 939705681 is about 30654.6192440878. The cubic root of 939705681 is about 979.4838601696.

The spelling of 939705681 in words is "nine hundred thirty-nine million, seven hundred five thousand, six hundred eighty-one".