7822521 has 16 divisors (see below), whose sum is σ = 13244800. Its totient is φ = 4469904.

The previous prime is 7822519. The next prime is 7822531. The reversal of 7822521 is 1252287.

It is not a de Polignac number, because 7822521 - 2¹ = 7822519 is a prime.

It is a super-2 number, since 2×7822521² = 122383669590882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7822531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20506 + ... + 20883.

It is an arithmetic number, because the mean of its divisors is an integer number (827800).

Almost surely, 2^7822521 is an apocalyptic number.

It is an amenable number.

7822521 is a deficient number, since it is larger than the sum of its proper divisors (5422279).

7822521 is a wasteful number, since it uses less digits than its factorization.

7822521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41405 (or 41399 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 7822521 is about 2796.8770083792. The cubic root of 7822521 is about 198.5099344261.

The spelling of 7822521 in words is "seven million, eight hundred twenty-two thousand, five hundred twenty-one".