1227555 has 40 divisors (see below), whose sum is σ = 2520672. Its totient is φ = 559872.

The previous prime is 1227547. The next prime is 1227559. The reversal of 1227555 is 5557221.

It is a happy number.

It is not a de Polignac number, because 1227555 - 2³ = 1227547 is a prime.

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

1227555 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1227559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2619 + ... + 3051.

2^1227555 is an apocalyptic number.

1227555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1227555 is an abundant number, since it is smaller than the sum of its proper divisors (1293117).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1227555 is an equidigital number, since it uses as much as digits as its factorization.

1227555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457 (or 448 counting only the distinct ones).

The product of its digits is 3500, while the sum is 27.

The square root of 1227555 is about 1107.9508111825. The cubic root of 1227555 is about 107.0730860037.

It can be divided in two parts, 122755 and 5, that added together give a triangular number (122760 = T₄₉₅).

The spelling of 1227555 in words is "one million, two hundred twenty-seven thousand, five hundred fifty-five".