1242564 has 24 divisors (see below), whose sum is σ = 3070368. Its totient is φ = 389760.

The previous prime is 1242517. The next prime is 1242569. The reversal of 1242564 is 4652421.

It is not an unprimeable number, because it can be changed into a prime (1242569) 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 7 ways as a sum of consecutive naturals, for example, 2842 + ... + 3249.

It is an arithmetic number, because the mean of its divisors is an integer number (127932).

2^1242564 is an apocalyptic number.

It is an amenable number.

1242564 is an abundant number, since it is smaller than the sum of its proper divisors (1827804).

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

1242564 is a wasteful number, since it uses less digits than its factorization.

1242564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115 (or 6113 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 1242564 is about 1114.7035480342. The cubic root of 1242564 is about 107.5077045136.

Adding to 1242564 its reverse (4652421), we get a palindrome (5894985).

The spelling of 1242564 in words is "one million, two hundred forty-two thousand, five hundred sixty-four".