7085821 has 8 divisors (see below), whose sum is σ = 7626744. Its totient is φ = 6558720.

The previous prime is 7085809. The next prime is 7085839. The reversal of 7085821 is 1285807.

7085821 = T₂₇₈ + T₂₇₉ + ... + T₃₉₉.

It can be written as a sum of positive squares in 4 ways, for example, as 4900 + 7080921 = 70^2 + 2661^2 .

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

It is not a de Polignac number, because 7085821 - 2¹⁷ = 6954749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7085801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (953343).

Almost surely, 2^7085821 is an apocalyptic number.

It is an amenable number.

7085821 is a deficient number, since it is larger than the sum of its proper divisors (540923).

7085821 is a wasteful number, since it uses less digits than its factorization.

7085821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 7085821 is about 2661.9205472741. The cubic root of 7085821 is about 192.0717053497.

The spelling of 7085821 in words is "seven million, eighty-five thousand, eight hundred twenty-one".