1212722256 has 80 divisors (see below), whose sum is σ = 3204277056. Its totient is φ = 395086848.

The previous prime is 1212722239. The next prime is 1212722257. The reversal of 1212722256 is 6522272121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212722257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 795511 + ... + 797033.

Almost surely, 2^1212722256 is an apocalyptic number.

1212722256 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 1212722256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1602138528).

1212722256 is an abundant number, since it is smaller than the sum of its proper divisors (1991554800).

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

1212722256 is a wasteful number, since it uses less digits than its factorization.

1212722256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 1894 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 1212722256 is about 34824.1619568942. The cubic root of 1212722256 is about 1066.4007682710.

Adding to 1212722256 its reverse (6522272121), we get a palindrome (7734994377).

The spelling of 1212722256 in words is "one billion, two hundred twelve million, seven hundred twenty-two thousand, two hundred fifty-six".