1212320928 has 192 divisors, whose sum is σ = 3972471552. Its totient is φ = 315187200.

The previous prime is 1212320927. The next prime is 1212320929. The reversal of 1212320928 is 8290232121.

It is an interprime number because it is at equal distance from previous prime (1212320927) and next prime (1212320929).

It is a junction number, because it is equal to n+sod(n) for n = 1212320895 and 1212320904.

It is not an unprimeable number, because it can be changed into a prime (1212320927) 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, 636778 + ... + 638678.

It is an arithmetic number, because the mean of its divisors is an integer number (20689956).

Almost surely, 2^1212320928 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 1212320928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1986235776).

1212320928 is an abundant number, since it is smaller than the sum of its proper divisors (2760150624).

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

1212320928 is a wasteful number, since it uses less digits than its factorization.

1212320928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 1999 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1212320928 is about 34818.3992739471. The cubic root of 1212320928 is about 1066.2831200889.

The spelling of 1212320928 in words is "one billion, two hundred twelve million, three hundred twenty thousand, nine hundred twenty-eight".