444816139 has 4 divisors (see below), whose sum is σ = 444896424. Its totient is φ = 444735856.

The previous prime is 444816091. The next prime is 444816157. The reversal of 444816139 is 931618444.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 444816139 - 2¹¹ = 444814091 is a prime.

It is a super-2 number, since 2×444816139² = 395722795029734642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444816199) 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, 31162 + ... + 43135.

It is an arithmetic number, because the mean of its divisors is an integer number (111224106).

Almost surely, 2^444816139 is an apocalyptic number.

444816139 is a deficient number, since it is larger than the sum of its proper divisors (80285).

444816139 is an equidigital number, since it uses as much as digits as its factorization.

444816139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80284.

The product of its digits is 82944, while the sum is 40.

The square root of 444816139 is about 21090.6647358494. The cubic root of 444816139 is about 763.3555111159.

The spelling of 444816139 in words is "four hundred forty-four million, eight hundred sixteen thousand, one hundred thirty-nine".