1243431036 has 18 divisors (see below), whose sum is σ = 3143117432. Its totient is φ = 414477000.

The previous prime is 1243431029. The next prime is 1243431047. The reversal of 1243431036 is 6301343421.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1243431036² = 3092241482576066592, which contains 22 as substring.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 17269840 + ... + 17269911.

Almost surely, 2^1243431036 is an apocalyptic number.

It is an amenable number.

1243431036 is an abundant number, since it is smaller than the sum of its proper divisors (1899686396).

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

1243431036 is a wasteful number, since it uses less digits than its factorization.

1243431036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34539761 (or 34539756 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 1243431036 is about 35262.3175075037. The cubic root of 1243431036 is about 1075.3270426621.

Adding to 1243431036 its reverse (6301343421), we get a palindrome (7544774457).

The spelling of 1243431036 in words is "one billion, two hundred forty-three million, four hundred thirty-one thousand, thirty-six".