1138788 has 36 divisors (see below), whose sum is σ = 3290560. Its totient is φ = 325296.

The previous prime is 1138777. The next prime is 1138793. The reversal of 1138788 is 8878311.

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

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2008 + ... + 2511.

2^1138788 is an apocalyptic number.

1138788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1138788 is an abundant number, since it is smaller than the sum of its proper divisors (2151772).

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

1138788 is a wasteful number, since it uses less digits than its factorization.

1138788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536 (or 4531 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 1138788 is about 1067.1401032667. The cubic root of 1138788 is about 104.4273588403.

The spelling of 1138788 in words is "one million, one hundred thirty-eight thousand, seven hundred eighty-eight".