31320042 has 16 divisors (see below), whose sum is σ = 67458720. Its totient is φ = 9636912.

The previous prime is 31320041. The next prime is 31320049. The reversal of 31320042 is 24002313.

It is not an unprimeable number, because it can be changed into a prime (31320041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200692 + ... + 200847.

It is an arithmetic number, because the mean of its divisors is an integer number (4216170).

Almost surely, 2^31320042 is an apocalyptic number.

31320042 is an abundant number, since it is smaller than the sum of its proper divisors (36138678).

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

31320042 is a wasteful number, since it uses less digits than its factorization.

31320042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401557.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 31320042 is about 5596.4311842459. The cubic root of 31320042 is about 315.2154132503.

Adding to 31320042 its reverse (24002313), we get a palindrome (55322355).

The spelling of 31320042 in words is "thirty-one million, three hundred twenty thousand, forty-two".