38221312 has 40 divisors (see below), whose sum is σ = 80407800. Its totient is φ = 18100224.

The previous prime is 38221303. The next prime is 38221361. The reversal of 38221312 is 21312283.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7764 + ... + 11692.

It is an arithmetic number, because the mean of its divisors is an integer number (2010195).

Almost surely, 2^38221312 is an apocalyptic number.

38221312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40203900).

38221312 is an abundant number, since it is smaller than the sum of its proper divisors (42186488).

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

38221312 is an equidigital number, since it uses as much as digits as its factorization.

38221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966 (or 3950 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 38221312 is about 6182.3387160524. The cubic root of 38221312 is about 336.8489492030.

Adding to 38221312 its reverse (21312283), we get a palindrome (59533595).

The spelling of 38221312 in words is "thirty-eight million, two hundred twenty-one thousand, three hundred twelve".