444646021 has 4 divisors (see below), whose sum is σ = 444692844. Its totient is φ = 444599200.

The previous prime is 444646003. The next prime is 444646031. The reversal of 444646021 is 120646444.

444646021 = 14910² + 14911².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 222308100 + 222337921 = 14910^2 + 14911^2 .

It is a cyclic number.

It is not a de Polignac number, because 444646021 - 2¹⁷ = 444514949 is a prime.

It is a super-2 number, since 2×444646021² = 395420167982264882, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444646001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3550 + ... + 30031.

It is an arithmetic number, because the mean of its divisors is an integer number (111173211).

Almost surely, 2^444646021 is an apocalyptic number.

444646021 is the 14911-st centered square number.

It is an amenable number.

444646021 is a deficient number, since it is larger than the sum of its proper divisors (46823).

444646021 is a wasteful number, since it uses less digits than its factorization.

444646021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46822.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 444646021 is about 21086.6313336199. The cubic root of 444646021 is about 763.2581847078.

The spelling of 444646021 in words is "four hundred forty-four million, six hundred forty-six thousand, twenty-one".