1228365 has 28 divisors (see below), whose sum is σ = 2216604. Its totient is φ = 653184.

The previous prime is 1228351. The next prime is 1228373. The reversal of 1228365 is 5638221.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 842724 = 621^2 + 918^2 .

It is not a de Polignac number, because 1228365 - 2⁵ = 1228333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (2880) is a multiple of the sum of its prime factors (360).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3477 + ... + 3813.

2^1228365 is an apocalyptic number.

1228365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1228365 is a deficient number, since it is larger than the sum of its proper divisors (988239).

1228365 is an frugal number, since it uses more digits than its factorization.

1228365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 345 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1228365 is about 1108.3162905958. The cubic root of 1228365 is about 107.0966314879.

The spelling of 1228365 in words is "one million, two hundred twenty-eight thousand, three hundred sixty-five".