31140042 has 8 divisors (see below), whose sum is σ = 62280096. Its totient is φ = 10380012.

The previous prime is 31140029. The next prime is 31140047. The reversal of 31140042 is 24004113.

It is a sphenic number, since it is the product of 3 distinct primes.

31140042 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (31140047) 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 3 ways as a sum of consecutive naturals, for example, 2594998 + ... + 2595009.

It is an arithmetic number, because the mean of its divisors is an integer number (7785012).

Almost surely, 2^31140042 is an apocalyptic number.

31140042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31140042 is a wasteful number, since it uses less digits than its factorization.

31140042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5190012.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 31140042 is about 5580.3263345435. The cubic root of 31140042 is about 314.6103925888.

Adding to 31140042 its reverse (24004113), we get a palindrome (55144155).

The spelling of 31140042 in words is "thirty-one million, one hundred forty thousand, forty-two".