1243040100 has 36 divisors (see below), whose sum is σ = 3596530224. Its totient is φ = 331477280.

The previous prime is 1243040081. The next prime is 1243040147. The reversal of 1243040100 is 10403421.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1243040100.

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, 2071434 + ... + 2072033.

Almost surely, 2^1243040100 is an apocalyptic number.

1243040100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243040100 is an abundant number, since it is smaller than the sum of its proper divisors (2353490124).

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

1243040100 is a wasteful number, since it uses less digits than its factorization.

1243040100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143484 (or 4143477 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1243040100 is about 35256.7738172397. The cubic root of 1243040100 is about 1075.2143362058.

Adding to 1243040100 its reverse (10403421), we get a palindrome (1253443521).

The spelling of 1243040100 in words is "one billion, two hundred forty-three million, forty thousand, one hundred".