1242124420 has 12 divisors (see below), whose sum is σ = 2608461324. Its totient is φ = 496849760.

The previous prime is 1242124417. The next prime is 1242124427. The reversal of 1242124420 is 244212421.

It can be written as a sum of positive squares in 2 ways, for example, as 319908996 + 922215424 = 17886^2 + 30368^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1242124391 and 1242124400.

It is not an unprimeable number, because it can be changed into a prime (1242124427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31053091 + ... + 31053130.

It is an arithmetic number, because the mean of its divisors is an integer number (217371777).

Almost surely, 2^1242124420 is an apocalyptic number.

1242124420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242124420 is an abundant number, since it is smaller than the sum of its proper divisors (1366336904).

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

1242124420 is a wasteful number, since it uses less digits than its factorization.

1242124420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62106230 (or 62106228 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1242124420 is about 35243.7855514983. The cubic root of 1242124420 is about 1074.9502540528.

Adding to 1242124420 its reverse (244212421), we get a palindrome (1486336841).

The spelling of 1242124420 in words is "one billion, two hundred forty-two million, one hundred twenty-four thousand, four hundred twenty".