31204422 has 48 divisors (see below), whose sum is σ = 74280960. Its totient is φ = 9423216.

The previous prime is 31204421. The next prime is 31204423. The reversal of 31204422 is 22440213.

It is an interprime number because it is at equal distance from previous prime (31204421) and next prime (31204423).

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

It is a junction number, because it is equal to n+sod(n) for n = 31204395 and 31204404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31204421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5883 + ... + 9849.

It is an arithmetic number, because the mean of its divisors is an integer number (1547520).

Almost surely, 2^31204422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31204422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37140480).

31204422 is an abundant number, since it is smaller than the sum of its proper divisors (43076538).

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

31204422 is a wasteful number, since it uses less digits than its factorization.

31204422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017 (or 4014 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 31204422 is about 5586.0918359798. The cubic root of 31204422 is about 314.8270554813.

Adding to 31204422 its reverse (22440213), we get a palindrome (53644635).

It can be divided in two parts, 31204 and 422, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 31204422 in words is "thirty-one million, two hundred four thousand, four hundred twenty-two".