444640139 has 2 divisors, whose sum is σ = 444640140. Its totient is φ = 444640138.

The previous prime is 444640129. The next prime is 444640181. The reversal of 444640139 is 931046444.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 444640139 - 2²⁴ = 427862923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 444640099 and 444640108.

It is not a weakly prime, because it can be changed into another prime (444640129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222320069 + 222320070.

It is an arithmetic number, because the mean of its divisors is an integer number (222320070).

Almost surely, 2^444640139 is an apocalyptic number.

444640139 is a deficient number, since it is larger than the sum of its proper divisors (1).

444640139 is an equidigital number, since it uses as much as digits as its factorization.

444640139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 444640139 is about 21086.4918609047. The cubic root of 444640139 is about 763.2548191060.

The spelling of 444640139 in words is "four hundred forty-four million, six hundred forty thousand, one hundred thirty-nine".