1138645 has 4 divisors (see below), whose sum is σ = 1366380. Its totient is φ = 910912.

The previous prime is 1138639. The next prime is 1138649. The reversal of 1138645 is 5468311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 509796 = 793^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138645 - 2³ = 1138637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113860 + ... + 113869.

It is an arithmetic number, because the mean of its divisors is an integer number (341595).

2^1138645 is an apocalyptic number.

It is an amenable number.

1138645 is a deficient number, since it is larger than the sum of its proper divisors (227735).

1138645 is an equidigital number, since it uses as much as digits as its factorization.

1138645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227734.

The product of its digits is 2880, while the sum is 28.

The square root of 1138645 is about 1067.0730996516. The cubic root of 1138645 is about 104.4229876031.

The spelling of 1138645 in words is "one million, one hundred thirty-eight thousand, six hundred forty-five".