4400921 has 8 divisors (see below), whose sum is σ = 5146944. Its totient is φ = 3684240.

The previous prime is 4400917. The next prime is 4400923. The reversal of 4400921 is 1290044.

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

It is not a de Polignac number, because 4400921 - 2² = 4400917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4400893 and 4400902.

It is not an unprimeable number, because it can be changed into a prime (4400923) 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, 7010 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (643368).

Almost surely, 2^4400921 is an apocalyptic number.

It is an amenable number.

4400921 is a deficient number, since it is larger than the sum of its proper divisors (746023).

4400921 is a wasteful number, since it uses less digits than its factorization.

4400921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14671.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4400921 is about 2097.8372196145. The cubic root of 4400921 is about 163.8756865784.

Adding to 4400921 its reverse (1290044), we get a palindrome (5690965).

The spelling of 4400921 in words is "four million, four hundred thousand, nine hundred twenty-one".