4392921 has 16 divisors (see below), whose sum is σ = 6398336. Its totient is φ = 2664576.

The previous prime is 4392911. The next prime is 4392929. The reversal of 4392921 is 1292934.

It is not a de Polignac number, because 4392921 - 2¹⁰ = 4391897 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4392929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2076 + ... + 3618.

It is an arithmetic number, because the mean of its divisors is an integer number (399896).

Almost surely, 2^4392921 is an apocalyptic number.

It is an amenable number.

4392921 is a deficient number, since it is larger than the sum of its proper divisors (2005415).

4392921 is a wasteful number, since it uses less digits than its factorization.

4392921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its digits is 3888, while the sum is 30.

The square root of 4392921 is about 2095.9296266812. The cubic root of 4392921 is about 163.7763285366.

The spelling of 4392921 in words is "four million, three hundred ninety-two thousand, nine hundred twenty-one".