133311240 has 96 divisors (see below), whose sum is σ = 439807680. Its totient is φ = 35012736.

The previous prime is 133311203. The next prime is 133311287. The reversal of 133311240 is 42113331.

133311240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 21357 + ... + 26883.

It is an arithmetic number, because the mean of its divisors is an integer number (4581330).

Almost surely, 2^133311240 is an apocalyptic number.

133311240 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 133311240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219903840).

133311240 is an abundant number, since it is smaller than the sum of its proper divisors (306496440).

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

133311240 is a wasteful number, since it uses less digits than its factorization.

133311240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611 (or 5604 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 133311240 is about 11546.0486747632. The cubic root of 133311240 is about 510.8447361542.

Adding to 133311240 its reverse (42113331), we get a palindrome (175424571).

The spelling of 133311240 in words is "one hundred thirty-three million, three hundred eleven thousand, two hundred forty".