1242540887 has 4 divisors (see below), whose sum is σ = 1420046736. Its totient is φ = 1065035040.

The previous prime is 1242540869. The next prime is 1242540889. The reversal of 1242540887 is 7880452421.

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 1242540887 - 2⁸ = 1242540631 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 (1242540889) 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, 88752914 + ... + 88752927.

It is an arithmetic number, because the mean of its divisors is an integer number (355011684).

Almost surely, 2^1242540887 is an apocalyptic number.

1242540887 is a deficient number, since it is larger than the sum of its proper divisors (177505849).

1242540887 is an equidigital number, since it uses as much as digits as its factorization.

1242540887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177505848.

The product of its (nonzero) digits is 143360, while the sum is 41.

The square root of 1242540887 is about 35249.6934312910. The cubic root of 1242540887 is about 1075.0703792394.

The spelling of 1242540887 in words is "one billion, two hundred forty-two million, five hundred forty thousand, eight hundred eighty-seven".