1245242 has 4 divisors (see below), whose sum is σ = 1867866. Its totient is φ = 622620.

The previous prime is 1245227. The next prime is 1245281. The reversal of 1245242 is 2425421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2425421 = 61 ⋅39761.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 606841 = 799^2 + 779^2 .

It is a d-powerful number, because it can be written as 1 + 2¹⁶ + 4² + 5² + 2¹⁷ + 4² + 2²⁰ .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311309 + ... + 311312.

2^1245242 is an apocalyptic number.

1245242 is a deficient number, since it is larger than the sum of its proper divisors (622624).

1245242 is an equidigital number, since it uses as much as digits as its factorization.

1245242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622623.

The product of its digits is 640, while the sum is 20.

The square root of 1245242 is about 1115.9041177449. The cubic root of 1245242 is about 107.5848833810.

It can be divided in two parts, 12 and 45242, that added together give a palindrome (45254).

The spelling of 1245242 in words is "one million, two hundred forty-five thousand, two hundred forty-two".