444140021 has 8 divisors (see below), whose sum is σ = 478495584. Its totient is φ = 409811760.

The previous prime is 444140009. The next prime is 444140027. The reversal of 444140021 is 120041444.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444140021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 444139975 and 444140002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444140027) 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, 37826 + ... + 48156.

It is an arithmetic number, because the mean of its divisors is an integer number (59811948).

Almost surely, 2^444140021 is an apocalyptic number.

It is an amenable number.

444140021 is a deficient number, since it is larger than the sum of its proper divisors (34355563).

444140021 is a wasteful number, since it uses less digits than its factorization.

444140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13651.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 444140021 is about 21074.6297950877. The cubic root of 444140021 is about 762.9685496456.

Adding to 444140021 its reverse (120041444), we get a palindrome (564181465).

The spelling of 444140021 in words is "four hundred forty-four million, one hundred forty thousand, twenty-one".