1243420100 has 36 divisors (see below), whose sum is σ = 2905780164. Its totient is φ = 459108480.

The previous prime is 1243420093. The next prime is 1243420117. The reversal of 1243420100 is 10243421.

It can be written as a sum of positive squares in 6 ways, for example, as 359785024 + 883635076 = 18968^2 + 29726^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 476939 + ... + 479538.

Almost surely, 2^1243420100 is an apocalyptic number.

1243420100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243420100 is an abundant number, since it is smaller than the sum of its proper divisors (1662360064).

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

1243420100 is a wasteful number, since it uses less digits than its factorization.

1243420100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956504 (or 956497 counting only the distinct ones).

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

The square root of 1243420100 is about 35262.1624407806. The cubic root of 1243420100 is about 1075.3238901454.

Adding to 1243420100 its reverse (10243421), we get a palindrome (1253663521).

The spelling of 1243420100 in words is "one billion, two hundred forty-three million, four hundred twenty thousand, one hundred".