1138613816 has 8 divisors (see below), whose sum is σ = 2134900920. Its totient is φ = 569306904.

The previous prime is 1138613783. The next prime is 1138613821. The reversal of 1138613816 is 6183168311.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1138613816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71163356 + ... + 71163371.

It is an arithmetic number, because the mean of its divisors is an integer number (266862615).

Almost surely, 2^1138613816 is an apocalyptic number.

It is an amenable number.

1138613816 is a deficient number, since it is larger than the sum of its proper divisors (996287104).

1138613816 is a wasteful number, since it uses less digits than its factorization.

1138613816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142326733 (or 142326729 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 1138613816 is about 33743.3521749099. The cubic root of 1138613816 is about 1044.2203431905.

The spelling of 1138613816 in words is "one billion, one hundred thirty-eight million, six hundred thirteen thousand, eight hundred sixteen".