1242775787 has 16 divisors (see below), whose sum is σ = 1369132800. Its totient is φ = 1118694240.

The previous prime is 1242775763. The next prime is 1242775799. The reversal of 1242775787 is 7875772421.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1242775787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242775717) 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 15 ways as a sum of consecutive naturals, for example, 743789 + ... + 745457.

It is an arithmetic number, because the mean of its divisors is an integer number (85570800).

Almost surely, 2^1242775787 is an apocalyptic number.

1242775787 is a deficient number, since it is larger than the sum of its proper divisors (126357013).

1242775787 is a wasteful number, since it uses less digits than its factorization.

1242775787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306.

The product of its digits is 1536640, while the sum is 50.

The square root of 1242775787 is about 35253.0252177029. The cubic root of 1242775787 is about 1075.1381216433.

The spelling of 1242775787 in words is "one billion, two hundred forty-two million, seven hundred seventy-five thousand, seven hundred eighty-seven".