1213904736 has 288 divisors, whose sum is σ = 3970905120. Its totient is φ = 348364800.

The previous prime is 1213904729. The next prime is 1213904773. The reversal of 1213904736 is 6374093121.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1213904736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6706566 + ... + 6706746.

It is an arithmetic number, because the mean of its divisors is an integer number (13787865).

Almost surely, 2^1213904736 is an apocalyptic number.

1213904736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213904736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985452560).

1213904736 is an abundant number, since it is smaller than the sum of its proper divisors (2757000384).

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

1213904736 is a wasteful number, since it uses less digits than its factorization.

1213904736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 1213904736 is about 34841.1356875748. The cubic root of 1213904736 is about 1066.7472581469.

Adding to 1213904736 its reverse (6374093121), we get a palindrome (7587997857).

The spelling of 1213904736 in words is "one billion, two hundred thirteen million, nine hundred four thousand, seven hundred thirty-six".