38221765 has 4 divisors (see below), whose sum is σ = 45866124. Its totient is φ = 30577408.

The previous prime is 38221759. The next prime is 38221801. The reversal of 38221765 is 56712283.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18852964 + 19368801 = 4342^2 + 4401^2 .

It is a cyclic number.

It is not a de Polignac number, because 38221765 - 2⁷ = 38221637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38221765.

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, 3822172 + ... + 3822181.

It is an arithmetic number, because the mean of its divisors is an integer number (11466531).

Almost surely, 2^38221765 is an apocalyptic number.

It is an amenable number.

38221765 is a deficient number, since it is larger than the sum of its proper divisors (7644359).

38221765 is an equidigital number, since it uses as much as digits as its factorization.

38221765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7644358.

The product of its digits is 20160, while the sum is 34.

The square root of 38221765 is about 6182.3753525647. The cubic root of 38221765 is about 336.8502799787.

The spelling of 38221765 in words is "thirty-eight million, two hundred twenty-one thousand, seven hundred sixty-five".