3823621 has 4 divisors (see below), whose sum is σ = 3955500. Its totient is φ = 3691744.

The previous prime is 3823609. The next prime is 3823627. The reversal of 3823621 is 1263283.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 722500 + 3101121 = 850^2 + 1761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3823621 is a prime.

It is a d-powerful number, because it can be written as 3⁶ + 8⁷ + 2⁷ + 3¹³ + 6³ + 2¹⁷ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3823627) 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, 65896 + ... + 65953.

It is an arithmetic number, because the mean of its divisors is an integer number (988875).

Almost surely, 2^3823621 is an apocalyptic number.

It is an amenable number.

3823621 is a deficient number, since it is larger than the sum of its proper divisors (131879).

3823621 is a wasteful number, since it uses less digits than its factorization.

3823621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131878.

The product of its digits is 1728, while the sum is 25.

The square root of 3823621 is about 1955.4081415398. The cubic root of 3823621 is about 156.3717438374.

It can be divided in two parts, 3823 and 621, that added together give a palindrome (4444).

The spelling of 3823621 in words is "three million, eight hundred twenty-three thousand, six hundred twenty-one".