7839221 has 8 divisors (see below), whose sum is σ = 8487864. Its totient is φ = 7197120.

The previous prime is 7839211. The next prime is 7839233. The reversal of 7839221 is 1229387.

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 3783025 = 2014^2 + 1945^2 .

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 7839221 - 2⁶ = 7839157 is a prime.

It is a super-2 number, since 2×7839221² = 122906771773682, 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 (7839211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031 + ... + 4091.

It is an arithmetic number, because the mean of its divisors is an integer number (1060983).

Almost surely, 2^7839221 is an apocalyptic number.

It is an amenable number.

7839221 is a deficient number, since it is larger than the sum of its proper divisors (648643).

7839221 is a wasteful number, since it uses less digits than its factorization.

7839221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271.

The product of its digits is 6048, while the sum is 32.

The square root of 7839221 is about 2799.8608894015. The cubic root of 7839221 is about 198.6510977670.

The spelling of 7839221 in words is "seven million, eight hundred thirty-nine thousand, two hundred twenty-one".