1138565 has 8 divisors (see below), whose sum is σ = 1389048. Its totient is φ = 895680.

The previous prime is 1138559. The next prime is 1138567. The reversal of 1138565 is 5658311.

It can be written as a sum of positive squares in 4 ways, for example, as 2209 + 1136356 = 47^2 + 1066^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1138565 - 2¹⁴ = 1122181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1562 + ... + 2171.

It is an arithmetic number, because the mean of its divisors is an integer number (173631).

2^1138565 is an apocalyptic number.

It is an amenable number.

1138565 is a deficient number, since it is larger than the sum of its proper divisors (250483).

1138565 is an equidigital number, since it uses as much as digits as its factorization.

1138565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799.

The product of its digits is 3600, while the sum is 29.

The square root of 1138565 is about 1067.0356132763. The cubic root of 1138565 is about 104.4205419960.

The spelling of 1138565 in words is "one million, one hundred thirty-eight thousand, five hundred sixty-five".