31040224 has 36 divisors (see below), whose sum is σ = 64520064. Its totient is φ = 14697792.

The previous prime is 31040209. The next prime is 31040231. The reversal of 31040224 is 42204013.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 31040198 and 31040207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10209 + ... + 12895.

It is an arithmetic number, because the mean of its divisors is an integer number (1792224).

Almost surely, 2^31040224 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 31040224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32260032).

31040224 is an abundant number, since it is smaller than the sum of its proper divisors (33479840).

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

31040224 is a wasteful number, since it uses less digits than its factorization.

31040224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2708 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31040224 is about 5571.3754136658. The cubic root of 31040224 is about 314.2738762956.

Adding to 31040224 its reverse (42204013), we get a palindrome (73244237).

The spelling of 31040224 in words is "thirty-one million, forty thousand, two hundred twenty-four".