1242255 has 16 divisors (see below), whose sum is σ = 2271744. Its totient is φ = 567840.

The previous prime is 1242251. The next prime is 1242271. The reversal of 1242255 is 5522421.

It is a happy number.

It is not a de Polignac number, because 1242255 - 2² = 1242251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

1242255 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5811 + ... + 6020.

It is an arithmetic number, because the mean of its divisors is an integer number (141984).

2^1242255 is an apocalyptic number.

1242255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1242255 is a deficient number, since it is larger than the sum of its proper divisors (1029489).

1242255 is a wasteful number, since it uses less digits than its factorization.

1242255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11846.

The product of its digits is 800, while the sum is 21.

The square root of 1242255 is about 1114.5649375429. The cubic root of 1242255 is about 107.4987921263.

Adding to 1242255 its reverse (5522421), we get a palindrome (6764676).

The spelling of 1242255 in words is "one million, two hundred forty-two thousand, two hundred fifty-five".