1444668139 has 2 divisors, whose sum is σ = 1444668140. Its totient is φ = 1444668138.

The previous prime is 1444668103. The next prime is 1444668163. The reversal of 1444668139 is 9318664441.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1444668139 - 2¹³ = 1444659947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1444665139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722334069 + 722334070.

It is an arithmetic number, because the mean of its divisors is an integer number (722334070).

Almost surely, 2^1444668139 is an apocalyptic number.

1444668139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444668139 is an equidigital number, since it uses as much as digits as its factorization.

1444668139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 1444668139 is about 38008.7902859325. The cubic root of 1444668139 is about 1130.4621648288.

The spelling of 1444668139 in words is "one billion, four hundred forty-four million, six hundred sixty-eight thousand, one hundred thirty-nine".