1213509680 has 20 divisors (see below), whose sum is σ = 2821410192. Its totient is φ = 485403840.

The previous prime is 1213509679. The next prime is 1213509719. The reversal of 1213509680 is 869053121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1213509680.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7584356 + ... + 7584515.

Almost surely, 2^1213509680 is an apocalyptic number.

1213509680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213509680 is an abundant number, since it is smaller than the sum of its proper divisors (1607900512).

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

1213509680 is a wasteful number, since it uses less digits than its factorization.

1213509680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15168884 (or 15168878 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1213509680 is about 34835.4658358403. The cubic root of 1213509680 is about 1066.6315240158.

The spelling of 1213509680 in words is "one billion, two hundred thirteen million, five hundred nine thousand, six hundred eighty".