1405685 has 8 divisors (see below), whose sum is σ = 1728216. Its totient is φ = 1096960.

The previous prime is 1405681. The next prime is 1405693. The reversal of 1405685 is 5865041.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 131044 + 1274641 = 362^2 + 1129^2 .

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

It is not a de Polignac number, because 1405685 - 2² = 1405681 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 (1405681) 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 7 ways as a sum of consecutive naturals, for example, 3224 + ... + 3633.

It is an arithmetic number, because the mean of its divisors is an integer number (216027).

2^1405685 is an apocalyptic number.

It is an amenable number.

1405685 is a deficient number, since it is larger than the sum of its proper divisors (322531).

1405685 is an equidigital number, since it uses as much as digits as its factorization.

1405685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6903.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1405685 is about 1185.6158737129. The cubic root of 1405685 is about 112.0201122470.

It can be divided in two parts, 14056 and 85, that added together give a palindrome (14141).

The spelling of 1405685 in words is "one million, four hundred five thousand, six hundred eighty-five".