3628921 has 4 divisors (see below), whose sum is σ = 3683152. Its totient is φ = 3574692.

The previous prime is 3628897. The next prime is 3628927. The reversal of 3628921 is 1298263.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1298263 = 61 ⋅21283.

It is a cyclic number.

It is not a de Polignac number, because 3628921 - 2¹¹ = 3626873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3628927) 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, 27015 + ... + 27148.

It is an arithmetic number, because the mean of its divisors is an integer number (920788).

Almost surely, 2^3628921 is an apocalyptic number.

It is an amenable number.

3628921 is a deficient number, since it is larger than the sum of its proper divisors (54231).

3628921 is an equidigital number, since it uses as much as digits as its factorization.

3628921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54230.

The product of its digits is 5184, while the sum is 31.

The square root of 3628921 is about 1904.9727032165. The cubic root of 3628921 is about 153.6712077830.

The spelling of 3628921 in words is "three million, six hundred twenty-eight thousand, nine hundred twenty-one".