1242040055 has 4 divisors (see below), whose sum is σ = 1490448072. Its totient is φ = 993632040.

The previous prime is 1242040049. The next prime is 1242040069. The reversal of 1242040055 is 5500402421.

It is a happy number.

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

It is not a de Polignac number, because 1242040055 - 2¹⁶ = 1241974519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242040055.

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 3 ways as a sum of consecutive naturals, for example, 124204001 + ... + 124204010.

It is an arithmetic number, because the mean of its divisors is an integer number (372612018).

Almost surely, 2^1242040055 is an apocalyptic number.

1242040055 is a deficient number, since it is larger than the sum of its proper divisors (248408017).

1242040055 is an equidigital number, since it uses as much as digits as its factorization.

1242040055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248408016.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1242040055 is about 35242.5886535027. The cubic root of 1242040055 is about 1074.9259166542.

Adding to 1242040055 its reverse (5500402421), we get a palindrome (6742442476).

The spelling of 1242040055 in words is "one billion, two hundred forty-two million, forty thousand, fifty-five".