3622821 has 8 divisors (see below), whose sum is σ = 4841760. Its totient is φ = 2409552.

The previous prime is 3622813. The next prime is 3622831. The reversal of 3622821 is 1282263.

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

It is not a de Polignac number, because 3622821 - 2³ = 3622813 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3622791 and 3622800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3622811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (605220).

Almost surely, 2^3622821 is an apocalyptic number.

It is an amenable number.

3622821 is a deficient number, since it is larger than the sum of its proper divisors (1218939).

3622821 is a wasteful number, since it uses less digits than its factorization.

3622821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835.

The product of its digits is 1152, while the sum is 24.

The square root of 3622821 is about 1903.3709570128. The cubic root of 3622821 is about 153.5850554443.

The spelling of 3622821 in words is "three million, six hundred twenty-two thousand, eight hundred twenty-one".