1143138438 has 48 divisors (see below), whose sum is σ = 2681392896. Its totient is φ = 349879680.

The previous prime is 1143138427. The next prime is 1143138449. The reversal of 1143138438 is 8348313411.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1143138427) and next prime (1143138449).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31906 + ... + 57482.

It is an arithmetic number, because the mean of its divisors is an integer number (55862352).

Almost surely, 2^1143138438 is an apocalyptic number.

1143138438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1143138438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340696448).

1143138438 is an abundant number, since it is smaller than the sum of its proper divisors (1538254458).

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

1143138438 is a wasteful number, since it uses less digits than its factorization.

1143138438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25789 (or 25786 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1143138438 is about 33810.3303444376. The cubic root of 1143138438 is about 1045.6016888563.

The spelling of 1143138438 in words is "one billion, one hundred forty-three million, one hundred thirty-eight thousand, four hundred thirty-eight".