38427221 has 6 divisors (see below), whose sum is σ = 44701110. Its totient is φ = 32937576.

The previous prime is 38427211. The next prime is 38427223. The reversal of 38427221 is 12272483.

It can be written as a sum of positive squares in only one way, i.e., 23872996 + 14554225 = 4886^2 + 3815^2 .

It is a de Polignac number, because none of the positive numbers 2^k-38427221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38427223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 392066 + ... + 392163.

It is an arithmetic number, because the mean of its divisors is an integer number (7450185).

Almost surely, 2^38427221 is an apocalyptic number.

It is an amenable number.

38427221 is a deficient number, since it is larger than the sum of its proper divisors (6273889).

38427221 is an equidigital number, since it uses as much as digits as its factorization.

38427221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784243 (or 784236 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 38427221 is about 6198.9693498194. The cubic root of 38427221 is about 337.4527663208.

The spelling of 38427221 in words is "thirty-eight million, four hundred twenty-seven thousand, two hundred twenty-one".