1213793280 has 528 divisors, whose sum is σ = 4966251264. Its totient is φ = 268369920.

The previous prime is 1213793261. The next prime is 1213793299. The reversal of 1213793280 is 823973121.

1213793280 is a `hidden beast` number, since 1 + 2 + 1 + 379 + 3 + 280 = 666.

It is an interprime number because it is at equal distance from previous prime (1213793261) and next prime (1213793299).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17095645 + ... + 17095715.

Almost surely, 2^1213793280 is an apocalyptic number.

1213793280 is a gapful number since it is divisible by the number (10) 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 1213793280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483125632).

1213793280 is an abundant number, since it is smaller than the sum of its proper divisors (3752457984).

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

1213793280 is a wasteful number, since it uses less digits than its factorization.

1213793280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1213793280 is about 34839.5361622396. The cubic root of 1213793280 is about 1066.7146089563.

The spelling of 1213793280 in words is "one billion, two hundred thirteen million, seven hundred ninety-three thousand, two hundred eighty".