1242135442 has 32 divisors (see below), whose sum is σ = 1929668400. Its totient is φ = 599436288.

The previous prime is 1242135403. The next prime is 1242135443. The reversal of 1242135442 is 2445312421.

It can be written as a sum of positive squares in 8 ways, for example, as 814017961 + 428117481 = 28531^2 + 20691^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1242135442.

It is not an unprimeable number, because it can be changed into a prime (1242135443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1415908 + ... + 1416784.

Almost surely, 2^1242135442 is an apocalyptic number.

1242135442 is a deficient number, since it is larger than the sum of its proper divisors (687532958).

1242135442 is a wasteful number, since it uses less digits than its factorization.

1242135442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150.

The product of its digits is 7680, while the sum is 28.

The square root of 1242135442 is about 35243.9419191441. The cubic root of 1242135442 is about 1074.9534335697.

Adding to 1242135442 its reverse (2445312421), we get a palindrome (3687447863).

The spelling of 1242135442 in words is "one billion, two hundred forty-two million, one hundred thirty-five thousand, four hundred forty-two".