1242261887 has 4 divisors (see below), whose sum is σ = 1242472320. Its totient is φ = 1242051456.

The previous prime is 1242261871. The next prime is 1242261949. The reversal of 1242261887 is 7881622421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1242261887 - 2⁴ = 1242261871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242261817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96098 + ... + 108255.

It is an arithmetic number, because the mean of its divisors is an integer number (310618080).

Almost surely, 2^1242261887 is an apocalyptic number.

1242261887 is a deficient number, since it is larger than the sum of its proper divisors (210433).

1242261887 is an equidigital number, since it uses as much as digits as its factorization.

1242261887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210432.

The product of its digits is 86016, while the sum is 41.

The square root of 1242261887 is about 35245.7357278863. The cubic root of 1242261887 is about 1074.9899078194.

The spelling of 1242261887 in words is "one billion, two hundred forty-two million, two hundred sixty-one thousand, eight hundred eighty-seven".