1242505 has 32 divisors (see below), whose sum is σ = 1814400. Its totient is φ = 806400.

The previous prime is 1242503. The next prime is 1242517. The reversal of 1242505 is 5052421.

It is not a de Polignac number, because 1242505 - 2¹ = 1242503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1242503) 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 31 ways as a sum of consecutive naturals, for example, 30285 + ... + 30325.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2^1242505 is an apocalyptic number.

It is an amenable number.

1242505 is a deficient number, since it is larger than the sum of its proper divisors (571895).

1242505 is a wasteful number, since it uses less digits than its factorization.

1242505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 1242505 is about 1114.6770832847. The cubic root of 1242505 is about 107.5060029098.

Adding to 1242505 its reverse (5052421), we get a palindrome (6294926).

The spelling of 1242505 in words is "one million, two hundred forty-two thousand, five hundred five".