1138344678 has 48 divisors (see below), whose sum is σ = 2562605136. Its totient is φ = 378730080.

The previous prime is 1138344659. The next prime is 1138344703. The reversal of 1138344678 is 8764438311.

1138344678 is a `hidden beast` number, since 1 + 138 + 3 + 446 + 78 = 666.

1138344678 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296008 + ... + 299828.

It is an arithmetic number, because the mean of its divisors is an integer number (53387607).

Almost surely, 2^1138344678 is an apocalyptic number.

1138344678 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 1138344678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1281302568).

1138344678 is an abundant number, since it is smaller than the sum of its proper divisors (1424260458).

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

1138344678 is an equidigital number, since it uses as much as digits as its factorization.

1138344678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451 (or 4439 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 1138344678 is about 33739.3639240576. The cubic root of 1138344678 is about 1044.1380614086.

The spelling of 1138344678 in words is "one billion, one hundred thirty-eight million, three hundred forty-four thousand, six hundred seventy-eight".