1138378436 has 24 divisors (see below), whose sum is σ = 2150227800. Its totient is φ = 524224512.

The previous prime is 1138378427. The next prime is 1138378453. The reversal of 1138378436 is 6348738311.

It can be written as a sum of positive squares in 4 ways, for example, as 6728836 + 1131649600 = 2594^2 + 33640^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1031 + ... + 47726.

It is an arithmetic number, because the mean of its divisors is an integer number (89592825).

Almost surely, 2^1138378436 is an apocalyptic number.

It is an amenable number.

1138378436 is a deficient number, since it is larger than the sum of its proper divisors (1011849364).

1138378436 is a wasteful number, since it uses less digits than its factorization.

1138378436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49223 (or 49221 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 1138378436 is about 33739.8641965257. The cubic root of 1138378436 is about 1044.1483827302.

The spelling of 1138378436 in words is "one billion, one hundred thirty-eight million, three hundred seventy-eight thousand, four hundred thirty-six".