1238805 has 12 divisors (see below), whose sum is σ = 2147340. Its totient is φ = 660672.

The previous prime is 1238801. The next prime is 1238821. The reversal of 1238805 is 5088321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 439569 + 799236 = 663^2 + 894^2 .

It is not a de Polignac number, because 1238805 - 2² = 1238801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1238801) 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 11 ways as a sum of consecutive naturals, for example, 13720 + ... + 13809.

It is an arithmetic number, because the mean of its divisors is an integer number (178945).

2^1238805 is an apocalyptic number.

1238805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1238805 is a deficient number, since it is larger than the sum of its proper divisors (908535).

1238805 is a wasteful number, since it uses less digits than its factorization.

1238805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27540 (or 27537 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1238805 is about 1113.0161723892. The cubic root of 1238805 is about 107.3991843722.

The spelling of 1238805 in words is "one million, two hundred thirty-eight thousand, eight hundred five".