31942005 has 16 divisors (see below), whose sum is σ = 51223104. Its totient is φ = 16997120.

The previous prime is 31941971. The next prime is 31942007. The reversal of 31942005 is 50024913.

It is not a de Polignac number, because 31942005 - 2¹⁵ = 31909237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31942007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5197 + ... + 9533.

It is an arithmetic number, because the mean of its divisors is an integer number (3201444).

Almost surely, 2^31942005 is an apocalyptic number.

It is an amenable number.

31942005 is a deficient number, since it is larger than the sum of its proper divisors (19281099).

31942005 is a wasteful number, since it uses less digits than its factorization.

31942005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4836.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 31942005 is about 5651.7258426077. The cubic root of 31942005 is about 317.2882999860.

Adding to 31942005 its reverse (50024913), we get a palindrome (81966918).

It can be divided in two parts, 319 and 42005, that added together give a palindrome (42324).

The spelling of 31942005 in words is "thirty-one million, nine hundred forty-two thousand, five".