444428138 has 48 divisors (see below), whose sum is σ = 854108064. Its totient is φ = 171491040.

The previous prime is 444428129. The next prime is 444428147. The reversal of 444428138 is 831824444.

It is an interprime number because it is at equal distance from previous prime (444428129) and next prime (444428147).

It is a super-2 number, since 2×444428138² = 395032739692294088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113420 + ... + 117272.

It is an arithmetic number, because the mean of its divisors is an integer number (17793918).

Almost surely, 2^444428138 is an apocalyptic number.

444428138 is a deficient number, since it is larger than the sum of its proper divisors (409679926).

444428138 is a wasteful number, since it uses less digits than its factorization.

444428138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 3980 counting only the distinct ones).

The product of its digits is 98304, while the sum is 38.

The square root of 444428138 is about 21081.4643229544. The cubic root of 444428138 is about 763.1334951451.

The spelling of 444428138 in words is "four hundred forty-four million, four hundred twenty-eight thousand, one hundred thirty-eight".