1228705 has 4 divisors (see below), whose sum is σ = 1474452. Its totient is φ = 982960.

The previous prime is 1228693. The next prime is 1228741. The reversal of 1228705 is 5078221.

1228705 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5078221 = 379 ⋅13399.

It can be written as a sum of positive squares in 2 ways, for example, as 132496 + 1096209 = 364^2 + 1047^2 .

It is not a de Polignac number, because 1228705 - 2⁹ = 1228193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122866 + ... + 122875.

It is an arithmetic number, because the mean of its divisors is an integer number (368613).

2^1228705 is an apocalyptic number.

It is an amenable number.

1228705 is a deficient number, since it is larger than the sum of its proper divisors (245747).

1228705 is an equidigital number, since it uses as much as digits as its factorization.

1228705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245746.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1228705 is about 1108.4696658006. The cubic root of 1228705 is about 107.1065116933.

The spelling of 1228705 in words is "one million, two hundred twenty-eight thousand, seven hundred five".