1233991880 has 96 divisors (see below), whose sum is σ = 3075763320. Its totient is φ = 445209600.

The previous prime is 1233991877. The next prime is 1233991901. The reversal of 1233991880 is 881993321.

It can be written as a sum of positive squares in 4 ways, for example, as 603881476 + 630110404 = 24574^2 + 25102^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 662150 + ... + 664010.

Almost surely, 2^1233991880 is an apocalyptic number.

1233991880 is a gapful number since it is divisible by the number (10) 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 1233991880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1537881660).

1233991880 is an abundant number, since it is smaller than the sum of its proper divisors (1841771440).

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

1233991880 is a wasteful number, since it uses less digits than its factorization.

1233991880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2031 (or 2016 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1233991880 is about 35128.2205640992. The cubic root of 1233991880 is about 1072.5991142239.

The spelling of 1233991880 in words is "one billion, two hundred thirty-three million, nine hundred ninety-one thousand, eight hundred eighty".