1213683856 has 160 divisors (see below), whose sum is σ = 3131799552. Its totient is φ = 441108480.

The previous prime is 1213683853. The next prime is 1213683859. The reversal of 1213683856 is 6583863121.

It is an interprime number because it is at equal distance from previous prime (1213683853) and next prime (1213683859).

It is not an unprimeable number, because it can be changed into a prime (1213683853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3497475 + ... + 3497821.

Almost surely, 2^1213683856 is an apocalyptic number.

1213683856 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 1213683856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1565899776).

1213683856 is an abundant number, since it is smaller than the sum of its proper divisors (1918115696).

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

1213683856 is a wasteful number, since it uses less digits than its factorization.

1213683856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 551 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 1213683856 is about 34837.9657270628. The cubic root of 1213683856 is about 1066.6825530620.

The spelling of 1213683856 in words is "one billion, two hundred thirteen million, six hundred eighty-three thousand, eight hundred fifty-six".