1242123200 has 42 divisors (see below), whose sum is σ = 3056403336. Its totient is φ = 496848640.

The previous prime is 1242123199. The next prime is 1242123217. The reversal of 1242123200 is 23212421.

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 5 ways as a sum of consecutive naturals, for example, 386564 + ... + 389763.

It is an arithmetic number, because the mean of its divisors is an integer number (72771508).

Almost surely, 2^1242123200 is an apocalyptic number.

1242123200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242123200 is an abundant number, since it is smaller than the sum of its proper divisors (1814280136).

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

1242123200 is an equidigital number, since it uses as much as digits as its factorization.

1242123200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776349 (or 776334 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1242123200 is about 35243.7682434782. The cubic root of 1242123200 is about 1074.9499021182.

Adding to 1242123200 its reverse (23212421), we get a palindrome (1265335621).

The spelling of 1242123200 in words is "one billion, two hundred forty-two million, one hundred twenty-three thousand, two hundred".