4021445 has 8 divisors (see below), whose sum is σ = 5079840. Its totient is φ = 3047760.

The previous prime is 4021439. The next prime is 4021447. The reversal of 4021445 is 5441204.

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

It is not a de Polignac number, because 4021445 - 2⁸ = 4021189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21071 + ... + 21260.

It is an arithmetic number, because the mean of its divisors is an integer number (634980).

Almost surely, 2^4021445 is an apocalyptic number.

It is an amenable number.

4021445 is a deficient number, since it is larger than the sum of its proper divisors (1058395).

4021445 is a wasteful number, since it uses less digits than its factorization.

4021445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42355.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 4021445 is about 2005.3540834476. The cubic root of 4021445 is about 159.0232815347.

Adding to 4021445 its reverse (5441204), we get a palindrome (9462649).

The spelling of 4021445 in words is "four million, twenty-one thousand, four hundred forty-five".