1213918650 has 216 divisors, whose sum is σ = 3936310560. Its totient is φ = 277331040.

The previous prime is 1213918637. The next prime is 1213918669. The reversal of 1213918650 is 568193121.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 594331 + ... + 596369.

It is an arithmetic number, because the mean of its divisors is an integer number (18223660).

Almost surely, 2^1213918650 is an apocalyptic number.

1213918650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213918650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1968155280).

1213918650 is an abundant number, since it is smaller than the sum of its proper divisors (2722391910).

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

1213918650 is a wasteful number, since it uses less digits than its factorization.

1213918650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080 (or 2056 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1213918650 is about 34841.3353647647. The cubic root of 1213918650 is about 1066.7513338826.

The spelling of 1213918650 in words is "one billion, two hundred thirteen million, nine hundred eighteen thousand, six hundred fifty".