1243535868 has 24 divisors (see below), whose sum is σ = 3223982160. Its totient is φ = 414511920.

The previous prime is 1243535851. The next prime is 1243535893. The reversal of 1243535868 is 8685353421.

1243535868 is a `hidden beast` number, since 12 + 4 + 3 + 53 + 586 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5757003 + ... + 5757218.

It is an arithmetic number, because the mean of its divisors is an integer number (134332590).

Almost surely, 2^1243535868 is an apocalyptic number.

1243535868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1243535868 is an abundant number, since it is smaller than the sum of its proper divisors (1980446292).

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

1243535868 is a wasteful number, since it uses less digits than its factorization.

1243535868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11514234 (or 11514226 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 1243535868 is about 35263.8039354804. The cubic root of 1243535868 is about 1075.3572616056.

The spelling of 1243535868 in words is "one billion, two hundred forty-three million, five hundred thirty-five thousand, eight hundred sixty-eight".