38667221 has 4 divisors (see below), whose sum is σ = 38679744. Its totient is φ = 38654700.

The previous prime is 38667217. The next prime is 38667259. The reversal of 38667221 is 12276683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 38667221 - 2² = 38667217 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 (38667271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036 + ... + 9026.

It is an arithmetic number, because the mean of its divisors is an integer number (9669936).

Almost surely, 2^38667221 is an apocalyptic number.

It is an amenable number.

38667221 is a deficient number, since it is larger than the sum of its proper divisors (12523).

38667221 is an equidigital number, since it uses as much as digits as its factorization.

38667221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12522.

The product of its digits is 24192, while the sum is 35.

The square root of 38667221 is about 6218.2972749781. The cubic root of 38667221 is about 338.1538373980.

The spelling of 38667221 in words is "thirty-eight million, six hundred sixty-seven thousand, two hundred twenty-one".