1138556826 has 96 divisors (see below), whose sum is σ = 2763948096. Its totient is φ = 335808000.

The previous prime is 1138556821. The next prime is 1138556857. The reversal of 1138556826 is 6286558311.

1138556826 is a `hidden beast` number, since 1 + 1 + 3 + 85 + 568 + 2 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (1138556821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1291906 + ... + 1292786.

It is an arithmetic number, because the mean of its divisors is an integer number (28791126).

Almost surely, 2^1138556826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138556826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1381974048).

1138556826 is an abundant number, since it is smaller than the sum of its proper divisors (1625391270).

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

1138556826 is a wasteful number, since it uses less digits than its factorization.

1138556826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1065 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 1138556826 is about 33742.5077017106. The cubic root of 1138556826 is about 1044.2029210967.

The spelling of 1138556826 in words is "one billion, one hundred thirty-eight million, five hundred fifty-six thousand, eight hundred twenty-six".