1225805 has 8 divisors (see below), whose sum is σ = 1681152. Its totient is φ = 840528.

The previous prime is 1225787. The next prime is 1225817. The reversal of 1225805 is 5085221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1225805 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17477 + ... + 17546.

It is an arithmetic number, because the mean of its divisors is an integer number (210144).

2^1225805 is an apocalyptic number.

It is an amenable number.

1225805 is a deficient number, since it is larger than the sum of its proper divisors (455347).

1225805 is an equidigital number, since it uses as much as digits as its factorization.

1225805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35035.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1225805 is about 1107.1607832650. The cubic root of 1225805 is about 107.0221807454.

The spelling of 1225805 in words is "one million, two hundred twenty-five thousand, eight hundred five".