1242137428 has 24 divisors (see below), whose sum is σ = 2493735552. Its totient is φ = 530317344.

The previous prime is 1242137401. The next prime is 1242137441. The reversal of 1242137428 is 8247312421.

It is a junction number, because it is equal to n+sod(n) for n = 1242137393 and 1242137402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76975 + ... + 91702.

It is an arithmetic number, because the mean of its divisors is an integer number (103905648).

Almost surely, 2^1242137428 is an apocalyptic number.

It is an amenable number.

1242137428 is an abundant number, since it is smaller than the sum of its proper divisors (1251598124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242137428 is a wasteful number, since it uses less digits than its factorization.

1242137428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168951 (or 168949 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 1242137428 is about 35243.9700941877. The cubic root of 1242137428 is about 1074.9540064692.

Adding to 1242137428 its reverse (8247312421), we get a palindrome (9489449849).

The spelling of 1242137428 in words is "one billion, two hundred forty-two million, one hundred thirty-seven thousand, four hundred twenty-eight".