4020444 has 36 divisors (see below), whose sum is σ = 10515960. Its totient is φ = 1293600.

The previous prime is 4020433. The next prime is 4020461. The reversal of 4020444 is 4440204.

4020444 = T₅₁₂ + T₅₁₃ + ... + T₅₄₀.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 882 + ... + 2969.

It is an arithmetic number, because the mean of its divisors is an integer number (292110).

Almost surely, 2^4020444 is an apocalyptic number.

It is an amenable number.

4020444 is an abundant number, since it is smaller than the sum of its proper divisors (6495516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4020444 is a wasteful number, since it uses less digits than its factorization.

4020444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890 (or 3885 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 4020444 is about 2005.1044860555. The cubic root of 4020444 is about 159.0100859865.

Adding to 4020444 its reverse (4440204), we get a palindrome (8460648).

The spelling of 4020444 in words is "four million, twenty thousand, four hundred forty-four".