31438221 has 8 divisors (see below), whose sum is σ = 41961120. Its totient is φ = 20937072.

The previous prime is 31438213. The next prime is 31438223. The reversal of 31438221 is 12283413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31438221 - 2³ = 31438213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31438191 and 31438200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31438223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1695 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (5245140).

Almost surely, 2^31438221 is an apocalyptic number.

It is an amenable number.

31438221 is a deficient number, since it is larger than the sum of its proper divisors (10522899).

31438221 is a wasteful number, since it uses less digits than its factorization.

31438221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10875.

The product of its digits is 1152, while the sum is 24.

The square root of 31438221 is about 5606.9796682349. The cubic root of 31438221 is about 315.6113800089.

The spelling of 31438221 in words is "thirty-one million, four hundred thirty-eight thousand, two hundred twenty-one".