4407921 has 48 divisors (see below), whose sum is σ = 7840768. Its totient is φ = 2332800.

The previous prime is 4407917. The next prime is 4407929. The reversal of 4407921 is 1297044.

It is a happy number.

It is not a de Polignac number, because 4407921 - 2² = 4407917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4407929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72231 + ... + 72291.

Almost surely, 2^4407921 is an apocalyptic number.

It is an amenable number.

4407921 is a deficient number, since it is larger than the sum of its proper divisors (3432847).

4407921 is a wasteful number, since it uses less digits than its factorization.

4407921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 4407921 is about 2099.5049416470. The cubic root of 4407921 is about 163.9625261395.

It can be divided in two parts, 44079 and 21, that added together give a square (44100 = 210²).

The spelling of 4407921 in words is "four million, four hundred seven thousand, nine hundred twenty-one".