7365821 has 4 divisors (see below), whose sum is σ = 7408572. Its totient is φ = 7323072.

The previous prime is 7365803. The next prime is 7365823. The reversal of 7365821 is 1285637.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1285637 = 41 ⋅31357.

It can be written as a sum of positive squares in 2 ways, for example, as 6708100 + 657721 = 2590^2 + 811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7365821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7365823) 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, 21116 + ... + 21461.

It is an arithmetic number, because the mean of its divisors is an integer number (1852143).

Almost surely, 2^7365821 is an apocalyptic number.

It is an amenable number.

7365821 is a deficient number, since it is larger than the sum of its proper divisors (42751).

7365821 is a wasteful number, since it uses less digits than its factorization.

7365821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42750.

The product of its digits is 10080, while the sum is 32.

The square root of 7365821 is about 2714.0046057441. The cubic root of 7365821 is about 194.5690328858.

The spelling of 7365821 in words is "seven million, three hundred sixty-five thousand, eight hundred twenty-one".