1242686556 has 48 divisors (see below), whose sum is σ = 3276403200. Its totient is φ = 407205936.

The previous prime is 1242686539. The next prime is 1242686581. The reversal of 1242686556 is 6556862421.

1242686556 is a `hidden beast` number, since 12 + 4 + 2 + 6 + 86 + 556 = 666.

It is a super-2 number, since 2×1242686556² = 3088539752926282272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 91140 + ... + 103883.

It is an arithmetic number, because the mean of its divisors is an integer number (68258400).

Almost surely, 2^1242686556 is an apocalyptic number.

It is an amenable number.

1242686556 is an abundant number, since it is smaller than the sum of its proper divisors (2033716644).

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

1242686556 is a wasteful number, since it uses less digits than its factorization.

1242686556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195095 (or 195087 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 1242686556 is about 35251.7596156561. The cubic root of 1242686556 is about 1075.1123894753.

The spelling of 1242686556 in words is "one billion, two hundred forty-two million, six hundred eighty-six thousand, five hundred fifty-six".