1439663138 has 8 divisors (see below), whose sum is σ = 2159817132. Its totient is φ = 719724096.

The previous prime is 1439663131. The next prime is 1439663161. The reversal of 1439663138 is 8313669341.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 995591809 + 444071329 = 31553^2 + 21073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1439663131) 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, 35795 + ... + 64502.

Almost surely, 2^1439663138 is an apocalyptic number.

1439663138 is a deficient number, since it is larger than the sum of its proper divisors (720153994).

1439663138 is a wasteful number, since it uses less digits than its factorization.

1439663138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107476.

The product of its digits is 279936, while the sum is 44.

The square root of 1439663138 is about 37942.8931158392. The cubic root of 1439663138 is about 1129.1551724348.

The spelling of 1439663138 in words is "one billion, four hundred thirty-nine million, six hundred sixty-three thousand, one hundred thirty-eight".