1226405 has 8 divisors (see below), whose sum is σ = 1496184. Its totient is φ = 964800.

The previous prime is 1226387. The next prime is 1226417. The reversal of 1226405 is 5046221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 75076 + 1151329 = 274^2 + 1073^2 .

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

It is not a de Polignac number, because 1226405 - 2⁶ = 1226341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1706 + ... + 2315.

It is an arithmetic number, because the mean of its divisors is an integer number (187023).

2^1226405 is an apocalyptic number.

It is an amenable number.

1226405 is a deficient number, since it is larger than the sum of its proper divisors (269779).

1226405 is an equidigital number, since it uses as much as digits as its factorization.

1226405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1226405 is about 1107.4317134704. The cubic root of 1226405 is about 107.0396394315.

The spelling of 1226405 in words is "one million, two hundred twenty-six thousand, four hundred five".