1243214856 has 96 divisors (see below), whose sum is σ = 3663692760. Its totient is φ = 378556416.

The previous prime is 1243214851. The next prime is 1243214867. The reversal of 1243214856 is 6584123421.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1174158756 + 69056100 = 34266^2 + 8310^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1243214856.

It is not an unprimeable number, because it can be changed into a prime (1243214851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83946 + ... + 97638.

Almost surely, 2^1243214856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243214856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1831846380).

1243214856 is an abundant number, since it is smaller than the sum of its proper divisors (2420477904).

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

1243214856 is a wasteful number, since it uses less digits than its factorization.

1243214856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13815 (or 13808 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 1243214856 is about 35259.2520624020. The cubic root of 1243214856 is about 1075.2647211054.

The spelling of 1243214856 in words is "one billion, two hundred forty-three million, two hundred fourteen thousand, eight hundred fifty-six".