1138279068 has 36 divisors (see below), whose sum is σ = 2983886360. Its totient is φ = 379426032.

The previous prime is 1138279057. The next prime is 1138279069. The reversal of 1138279068 is 8609728311.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138279069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 584563 + ... + 586506.

Almost surely, 2^1138279068 is an apocalyptic number.

1138279068 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1138279068 is an abundant number, since it is smaller than the sum of its proper divisors (1845607292).

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

1138279068 is a wasteful number, since it uses less digits than its factorization.

1138279068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171088 (or 1171074 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1138279068 is about 33738.3916036316. The cubic root of 1138279068 is about 1044.1180009309.

The spelling of 1138279068 in words is "one billion, one hundred thirty-eight million, two hundred seventy-nine thousand, sixty-eight".