31442380 has 48 divisors (see below), whose sum is σ = 71305920. Its totient is φ = 11610368.

The previous prime is 31442377. The next prime is 31442381. The reversal of 31442380 is 8324413.

It is not an unprimeable number, because it can be changed into a prime (31442381) 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, 12162 + ... + 14518.

It is an arithmetic number, because the mean of its divisors is an integer number (1485540).

Almost surely, 2^31442380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31442380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35652960).

31442380 is an abundant number, since it is smaller than the sum of its proper divisors (39863540).

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

31442380 is a wasteful number, since it uses less digits than its factorization.

31442380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418 (or 2416 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 31442380 is about 5607.3505330058. The cubic root of 31442380 is about 315.6252969314.

Adding to 31442380 its reverse (8324413), we get a palindrome (39766793).

The spelling of 31442380 in words is "thirty-one million, four hundred forty-two thousand, three hundred eighty".