1229805 has 12 divisors (see below), whose sum is σ = 2131740. Its totient is φ = 655872.

The previous prime is 1229783. The next prime is 1229807. The reversal of 1229805 is 5089221.

It can be written as a sum of positive squares in 2 ways, for example, as 514089 + 715716 = 717^2 + 846^2 .

It is not a de Polignac number, because 1229805 - 2⁵ = 1229773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13620 + ... + 13709.

It is an arithmetic number, because the mean of its divisors is an integer number (177645).

2^1229805 is an apocalyptic number.

1229805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1229805 is a deficient number, since it is larger than the sum of its proper divisors (901935).

1229805 is a wasteful number, since it uses less digits than its factorization.

1229805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27340 (or 27337 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1229805 is about 1108.9657343669. The cubic root of 1229805 is about 107.1384645818.

The spelling of 1229805 in words is "one million, two hundred twenty-nine thousand, eight hundred five".