1138660 has 36 divisors (see below), whose sum is σ = 2553012. Its totient is φ = 426496.

The previous prime is 1138649. The next prime is 1138667. The reversal of 1138660 is 668311.

It can be written as a sum of positive squares in 6 ways, for example, as 306916 + 831744 = 554^2 + 912^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138667) 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, 5682 + ... + 5878.

It is an arithmetic number, because the mean of its divisors is an integer number (70917).

2^1138660 is an apocalyptic number.

1138660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1138660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276506).

1138660 is an abundant number, since it is smaller than the sum of its proper divisors (1414352).

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

1138660 is a wasteful number, since it uses less digits than its factorization.

1138660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1138660 is about 1067.0801282003. The cubic root of 1138660 is about 104.4234461416.

The spelling of 1138660 in words is "one million, one hundred thirty-eight thousand, six hundred sixty".