133241240 has 128 divisors (see below), whose sum is σ = 354585600. Its totient is φ = 44513280.

The previous prime is 133241221. The next prime is 133241261. The reversal of 133241240 is 42142331.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351371 + ... + 351749.

It is an arithmetic number, because the mean of its divisors is an integer number (2770200).

Almost surely, 2^133241240 is an apocalyptic number.

133241240 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 133241240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177292800).

133241240 is an abundant number, since it is smaller than the sum of its proper divisors (221344360).

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

133241240 is a wasteful number, since it uses less digits than its factorization.

133241240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 133241240 is about 11543.0169366592. The cubic root of 133241240 is about 510.7553078553.

Adding to 133241240 its reverse (42142331), we get a palindrome (175383571).

The spelling of 133241240 in words is "one hundred thirty-three million, two hundred forty-one thousand, two hundred forty".