1242547 has 4 divisors (see below), whose sum is σ = 1315656. Its totient is φ = 1169440.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242547 is 7452421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7452421 = 431 ⋅17291.

It is a cyclic number.

It is not a de Polignac number, because 1242547 - 2⁷ = 1242419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36529 + ... + 36562.

It is an arithmetic number, because the mean of its divisors is an integer number (328914).

2^1242547 is an apocalyptic number.

1242547 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1242547 is a deficient number, since it is larger than the sum of its proper divisors (73109).

1242547 is an equidigital number, since it uses as much as digits as its factorization.

1242547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73108.

The product of its digits is 2240, while the sum is 25.

The square root of 1242547 is about 1114.6959226623. The cubic root of 1242547 is about 107.5072142265.

Adding to 1242547 its reverse (7452421), we get a palindrome (8694968).

The spelling of 1242547 in words is "one million, two hundred forty-two thousand, five hundred forty-seven".