38956221 has 10 divisors (see below), whose sum is σ = 58193982. Its totient is φ = 25970760.

The previous prime is 38956201. The next prime is 38956223. The reversal of 38956221 is 12265983.

38956221 is a `hidden beast` number, since 389 + 56 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36360900 + 2595321 = 6030^2 + 1611^2 .

It is not a de Polignac number, because 38956221 - 2⁶ = 38956157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38956223) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 240390 + ... + 240551.

Almost surely, 2^38956221 is an apocalyptic number.

It is an amenable number.

38956221 is a deficient number, since it is larger than the sum of its proper divisors (19237761).

38956221 is an equidigital number, since it uses as much as digits as its factorization.

38956221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480953 (or 480944 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 38956221 is about 6241.4918889637. The cubic root of 38956221 is about 338.9942046155.

The spelling of 38956221 in words is "thirty-eight million, nine hundred fifty-six thousand, two hundred twenty-one".