31085738 has 16 divisors (see below), whose sum is σ = 48503880. Its totient is φ = 14923776.

The previous prime is 31085731. The next prime is 31085801. The reversal of 31085738 is 83758013.

It can be written as a sum of positive squares in 4 ways, for example, as 18003049 + 13082689 = 4243^2 + 3617^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31085698 and 31085707.

It is not an unprimeable number, because it can be changed into a prime (31085731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9806 + ... + 12582.

Almost surely, 2^31085738 is an apocalyptic number.

31085738 is a deficient number, since it is larger than the sum of its proper divisors (17418142).

31085738 is a wasteful number, since it uses less digits than its factorization.

31085738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 31085738 is about 5575.4585461646. The cubic root of 31085738 is about 314.4274069282.

The spelling of 31085738 in words is "thirty-one million, eighty-five thousand, seven hundred thirty-eight".