1361805 has 8 divisors (see below), whose sum is σ = 2178912. Its totient is φ = 726288.

The previous prime is 1361803. The next prime is 1361809. The reversal of 1361805 is 5081631.

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

It is not a de Polignac number, because 1361805 - 2¹ = 1361803 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361803) 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, 45379 + ... + 45408.

It is an arithmetic number, because the mean of its divisors is an integer number (272364).

2^1361805 is an apocalyptic number.

1361805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1361805 is a deficient number, since it is larger than the sum of its proper divisors (817107).

1361805 is an equidigital number, since it uses as much as digits as its factorization.

1361805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90795.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1361805 is about 1166.9640097278. The cubic root of 1361805 is about 110.8421585802.

The spelling of 1361805 in words is "one million, three hundred sixty-one thousand, eight hundred five".