1242203420 has 48 divisors (see below), whose sum is σ = 2677183488. Its totient is φ = 483927360.

The previous prime is 1242203399. The next prime is 1242203423. The reversal of 1242203420 is 243022421.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1242203392 and 1242203401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242203423) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 195209 + ... + 201471.

It is an arithmetic number, because the mean of its divisors is an integer number (55774656).

Almost surely, 2^1242203420 is an apocalyptic number.

1242203420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242203420 is an abundant number, since it is smaller than the sum of its proper divisors (1434980068).

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

1242203420 is a wasteful number, since it uses less digits than its factorization.

1242203420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6530 (or 6528 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1242203420 is about 35244.9062986412. The cubic root of 1242203420 is about 1074.9730427709.

Adding to 1242203420 its reverse (243022421), we get a palindrome (1485225841).

The spelling of 1242203420 in words is "one billion, two hundred forty-two million, two hundred three thousand, four hundred twenty".