31330242 has 24 divisors (see below), whose sum is σ = 68520816. Its totient is φ = 10345176.

The previous prime is 31330223. The next prime is 31330249. The reversal of 31330242 is 24203313.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31330249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6208 + ... + 10059.

It is an arithmetic number, because the mean of its divisors is an integer number (2855034).

Almost surely, 2^31330242 is an apocalyptic number.

31330242 is an abundant number, since it is smaller than the sum of its proper divisors (37190574).

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

31330242 is a wasteful number, since it uses less digits than its factorization.

31330242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16382 (or 16379 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 31330242 is about 5597.3424051062. The cubic root of 31330242 is about 315.2496282773.

Adding to 31330242 its reverse (24203313), we get a palindrome (55533555).

The spelling of 31330242 in words is "thirty-one million, three hundred thirty thousand, two hundred forty-two".