3834390221 has 4 divisors (see below), whose sum is σ = 3834547200. Its totient is φ = 3834233244.

The previous prime is 3834390211. The next prime is 3834390229. The reversal of 3834390221 is 1220934383.

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.

It is a cyclic number.

It is not a de Polignac number, because 3834390221 - 2¹⁰ = 3834389197 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 (3834390229) 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, 33101 + ... + 93618.

It is an arithmetic number, because the mean of its divisors is an integer number (958636800).

Almost surely, 2^3834390221 is an apocalyptic number.

It is an amenable number.

3834390221 is a deficient number, since it is larger than the sum of its proper divisors (156979).

3834390221 is a wasteful number, since it uses less digits than its factorization.

3834390221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156978.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 3834390221 is about 61922.4532863484. The cubic root of 3834390221 is about 1565.1841312814.

The spelling of 3834390221 in words is "three billion, eight hundred thirty-four million, three hundred ninety thousand, two hundred twenty-one".