1138728 has 32 divisors (see below), whose sum is σ = 3015360. Its totient is φ = 357120.

The previous prime is 1138717. The next prime is 1138729. The reversal of 1138728 is 8278311.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1138695 and 1138704.

It is not an unprimeable number, because it can be changed into a prime (1138729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 988 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (94230).

2^1138728 is an apocalyptic number.

It is an amenable number.

1138728 is an abundant number, since it is smaller than the sum of its proper divisors (1876632).

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

1138728 is a wasteful number, since it uses less digits than its factorization.

1138728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817 (or 2813 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 1138728 is about 1067.1119903740. Note that the first 3 decimals coincide. The cubic root of 1138728 is about 104.4255247993.

The spelling of 1138728 in words is "one million, one hundred thirty-eight thousand, seven hundred twenty-eight".