1223965512 has 192 divisors, whose sum is σ = 4314945600. Its totient is φ = 317882880.

The previous prime is 1223965487. The next prime is 1223965553. The reversal of 1223965512 is 2155693221.

It is a happy number.

1223965512 is a `hidden beast` number, since 12 + 2 + 3 + 96 + 551 + 2 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111168 + ... + 121680.

It is an arithmetic number, because the mean of its divisors is an integer number (22473675).

Almost surely, 2^1223965512 is an apocalyptic number.

1223965512 is a gapful number since it is divisible by the number (12) 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 1223965512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2157472800).

1223965512 is an abundant number, since it is smaller than the sum of its proper divisors (3090980088).

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

1223965512 is a wasteful number, since it uses less digits than its factorization.

1223965512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10553 (or 10536 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 1223965512 is about 34985.2184786661. The cubic root of 1223965512 is about 1069.6862013986.

The spelling of 1223965512 in words is "one billion, two hundred twenty-three million, nine hundred sixty-five thousand, five hundred twelve".