4644921 has 4 divisors (see below), whose sum is σ = 6193232. Its totient is φ = 3096612.

The previous prime is 4644907. The next prime is 4644953. The reversal of 4644921 is 1294464.

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.

It is not a de Polignac number, because 4644921 - 2²² = 450617 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4644971) 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, 774151 + ... + 774156.

It is an arithmetic number, because the mean of its divisors is an integer number (1548308).

Almost surely, 2^4644921 is an apocalyptic number.

It is an amenable number.

4644921 is a deficient number, since it is larger than the sum of its proper divisors (1548311).

4644921 is a wasteful number, since it uses less digits than its factorization.

4644921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548310.

The product of its digits is 6912, while the sum is 30.

The square root of 4644921 is about 2155.2078786048. The cubic root of 4644921 is about 166.8499614553.

It can be divided in two parts, 4644 and 921, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 4644921 in words is "four million, six hundred forty-four thousand, nine hundred twenty-one".