1243253100 has 36 divisors (see below), whose sum is σ = 3597146504. Its totient is φ = 331534080.

The previous prime is 1243253069. The next prime is 1243253101. The reversal of 1243253100 is 13523421.

It is a super-2 number, since 2×1243253100² = 3091356541319220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243253101) by changing a digit.

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, 2071789 + ... + 2072388.

Almost surely, 2^1243253100 is an apocalyptic number.

1243253100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243253100 is an abundant number, since it is smaller than the sum of its proper divisors (2353893404).

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

1243253100 is a wasteful number, since it uses less digits than its factorization.

1243253100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144194 (or 4144187 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1243253100 is about 35259.7943839722. The cubic root of 1243253100 is about 1075.2757468215.

Adding to 1243253100 its reverse (13523421), we get a palindrome (1256776521).

The spelling of 1243253100 in words is "one billion, two hundred forty-three million, two hundred fifty-three thousand, one hundred".