4397921 has 8 divisors (see below), whose sum is σ = 4856544. Its totient is φ = 3949120.

The previous prime is 4397909. The next prime is 4397923. The reversal of 4397921 is 1297934.

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

It is a cyclic number.

It is not a de Polignac number, because 4397921 - 2¹⁴ = 4381537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4397923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1496 + ... + 3321.

It is an arithmetic number, because the mean of its divisors is an integer number (607068).

Almost surely, 2^4397921 is an apocalyptic number.

It is an amenable number.

4397921 is a deficient number, since it is larger than the sum of its proper divisors (458623).

4397921 is a wasteful number, since it uses less digits than its factorization.

4397921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4911.

The product of its digits is 13608, while the sum is 35.

The square root of 4397921 is about 2097.1220756074. The cubic root of 4397921 is about 163.8384414342.

The spelling of 4397921 in words is "four million, three hundred ninety-seven thousand, nine hundred twenty-one".