1213634784 has 48 divisors (see below), whose sum is σ = 3233357568. Its totient is φ = 398504832.

The previous prime is 1213634783. The next prime is 1213634797. The reversal of 1213634784 is 4874363121.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213634783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87912 + ... + 100775.

It is an arithmetic number, because the mean of its divisors is an integer number (67361616).

Almost surely, 2^1213634784 is an apocalyptic number.

It is an amenable number.

1213634784 is an abundant number, since it is smaller than the sum of its proper divisors (2019722784).

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

1213634784 is a wasteful number, since it uses less digits than its factorization.

1213634784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188767 (or 188759 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 1213634784 is about 34837.2614308301. The cubic root of 1213634784 is about 1066.6681767340.

It can be divided in two parts, 1 and 213634784, that added together give a triangular number (213634785 = T₂₀₆₇₀).

The spelling of 1213634784 in words is "one billion, two hundred thirteen million, six hundred thirty-four thousand, seven hundred eighty-four".