1213239552 has 144 divisors (see below), whose sum is σ = 3736104960. Its totient is φ = 342337536.

The previous prime is 1213239541. The next prime is 1213239557. The reversal of 1213239552 is 2559323121.

It is not an unprimeable number, because it can be changed into a prime (1213239557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444849 + ... + 447567.

Almost surely, 2^1213239552 is an apocalyptic number.

1213239552 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 1213239552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1868052480).

1213239552 is an abundant number, since it is smaller than the sum of its proper divisors (2522865408).

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

1213239552 is an equidigital number, since it uses as much as digits as its factorization.

1213239552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828 (or 2814 counting only the distinct ones).

The product of its digits is 16200, while the sum is 33.

The square root of 1213239552 is about 34831.5884220057. The cubic root of 1213239552 is about 1066.5523738651.

The spelling of 1213239552 in words is "one billion, two hundred thirteen million, two hundred thirty-nine thousand, five hundred fifty-two".