3857282221 has 8 divisors (see below), whose sum is σ = 4163254200. Its totient is φ = 3552632832.

The previous prime is 3857282129. The next prime is 3857282237. The reversal of 3857282221 is 1222827583.

It can be written as a sum of positive squares in 4 ways, for example, as 27405225 + 3829876996 = 5235^2 + 61886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3857282221 - 2¹⁷ = 3857151149 is a prime.

It is a super-2 number, since 2×3857282221² = 29757252264885385682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3857282021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324580 + ... + 336253.

It is an arithmetic number, because the mean of its divisors is an integer number (520406775).

Almost surely, 2^3857282221 is an apocalyptic number.

It is an amenable number.

3857282221 is a deficient number, since it is larger than the sum of its proper divisors (305971979).

3857282221 is a wasteful number, since it uses less digits than its factorization.

3857282221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661295.

The product of its digits is 107520, while the sum is 40.

The square root of 3857282221 is about 62107.0223163210. The cubic root of 3857282221 is about 1568.2927634581.

The spelling of 3857282221 in words is "three billion, eight hundred fifty-seven million, two hundred eighty-two thousand, two hundred twenty-one".