1228555 has 4 divisors (see below), whose sum is σ = 1474272. Its totient is φ = 982840.

The previous prime is 1228547. The next prime is 1228567. The reversal of 1228555 is 5558221.

1228555 = 450² + 451² + ... + 455².

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1228555 - 2³ = 1228547 is a prime.

It is a Duffinian number.

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, 122851 + ... + 122860.

It is an arithmetic number, because the mean of its divisors is an integer number (368568).

2^1228555 is an apocalyptic number.

1228555 is a deficient number, since it is larger than the sum of its proper divisors (245717).

1228555 is an equidigital number, since it uses as much as digits as its factorization.

1228555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245716.

The product of its digits is 4000, while the sum is 28.

The square root of 1228555 is about 1108.4020028852. The cubic root of 1228555 is about 107.1021530038.

The spelling of 1228555 in words is "one million, two hundred twenty-eight thousand, five hundred fifty-five".