1213634136 has 128 divisors (see below), whose sum is σ = 3584448000. Its totient is φ = 337582080.

The previous prime is 1213634129. The next prime is 1213634197. The reversal of 1213634136 is 6314363121.

It is a nude number because it is divisible by every one of its digits.

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 31 ways as a sum of consecutive naturals, for example, 682080 + ... + 683856.

It is an arithmetic number, because the mean of its divisors is an integer number (28003500).

Almost surely, 2^1213634136 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 1213634136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1792224000).

1213634136 is an abundant number, since it is smaller than the sum of its proper divisors (2370813864).

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

1213634136 is a wasteful number, since it uses less digits than its factorization.

1213634136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009 (or 2005 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 1213634136 is about 34837.2521304422. The cubic root of 1213634136 is about 1066.6679868907.

Adding to 1213634136 its reverse (6314363121), we get a palindrome (7527997257).

The spelling of 1213634136 in words is "one billion, two hundred thirteen million, six hundred thirty-four thousand, one hundred thirty-six".