1438842138 has 16 divisors (see below), whose sum is σ = 2881242336. Its totient is φ = 479021040.

The previous prime is 1438842131. The next prime is 1438842143. The reversal of 1438842138 is 8312488341.

It is a super-2 number, since 2×1438842138² = 4140533396168822088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1438842138.

It is not an unprimeable number, because it can be changed into a prime (1438842131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142981 + ... + 152712.

It is an arithmetic number, because the mean of its divisors is an integer number (180077646).

Almost surely, 2^1438842138 is an apocalyptic number.

1438842138 is an abundant number, since it is smaller than the sum of its proper divisors (1442400198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1438842138 is a wasteful number, since it uses less digits than its factorization.

1438842138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296509.

The product of its digits is 147456, while the sum is 42.

The square root of 1438842138 is about 37932.0726826257. The cubic root of 1438842138 is about 1128.9404896503.

The spelling of 1438842138 in words is "one billion, four hundred thirty-eight million, eight hundred forty-two thousand, one hundred thirty-eight".