1215204256 has 24 divisors (see below), whose sum is σ = 2734210080. Its totient is φ = 520801728.

The previous prime is 1215204253. The next prime is 1215204269. The reversal of 1215204256 is 6524025121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1215204253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2712286 + ... + 2712733.

It is an arithmetic number, because the mean of its divisors is an integer number (113925420).

Almost surely, 2^1215204256 is an apocalyptic number.

1215204256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1215204256 is an abundant number, since it is smaller than the sum of its proper divisors (1519005824).

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

1215204256 is an equidigital number, since it uses as much as digits as its factorization.

1215204256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5425036 (or 5425028 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1215204256 is about 34859.7799189840. The cubic root of 1215204256 is about 1067.1277836178.

Adding to 1215204256 its reverse (6524025121), we get a palindrome (7739229377).

The spelling of 1215204256 in words is "one billion, two hundred fifteen million, two hundred four thousand, two hundred fifty-six".