444916991 has 8 divisors (see below), whose sum is σ = 479238144. Its totient is φ = 411843960.

The previous prime is 444916973. The next prime is 444916999. The reversal of 444916991 is 199619444.

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 not a de Polignac number, because 444916991 - 2¹⁴ = 444900607 is a prime.

It is a super-2 number, since 2×444916991² = 395902257760988162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444916999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311291 + ... + 312716.

It is an arithmetic number, because the mean of its divisors is an integer number (59904768).

Almost surely, 2^444916991 is an apocalyptic number.

444916991 is a deficient number, since it is larger than the sum of its proper divisors (34321153).

444916991 is a wasteful number, since it uses less digits than its factorization.

444916991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624061.

The product of its digits is 279936, while the sum is 47.

The square root of 444916991 is about 21093.0555159749. The cubic root of 444916991 is about 763.4131979561.

The spelling of 444916991 in words is "four hundred forty-four million, nine hundred sixteen thousand, nine hundred ninety-one".