1231304436 has 96 divisors (see below), whose sum is σ = 3270758400. Its totient is φ = 400468320.

The previous prime is 1231304413. The next prime is 1231304461. The reversal of 1231304436 is 6344031321.

It is a super-2 number, since 2×1231304436² = 3032221228226556192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 789025 + ... + 790583.

It is an arithmetic number, because the mean of its divisors is an integer number (34070400).

Almost surely, 2^1231304436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231304436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635379200).

1231304436 is an abundant number, since it is smaller than the sum of its proper divisors (2039453964).

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

1231304436 is a wasteful number, since it uses less digits than its factorization.

1231304436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1738 counting only the distinct ones).

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

The square root of 1231304436 is about 35089.9477913547. The cubic root of 1231304436 is about 1071.8198964621.

Adding to 1231304436 its reverse (6344031321), we get a palindrome (7575335757).

The spelling of 1231304436 in words is "one billion, two hundred thirty-one million, three hundred four thousand, four hundred thirty-six".