133431040 has 36 divisors (see below), whose sum is σ = 319612104. Its totient is φ = 53371904.

The previous prime is 133431031. The next prime is 133431061. The reversal of 133431040 is 40134331.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 133430999 and 133431017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50842 + ... + 53401.

It is an arithmetic number, because the mean of its divisors is an integer number (8878114).

Almost surely, 2^133431040 is an apocalyptic number.

133431040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133431040 is an abundant number, since it is smaller than the sum of its proper divisors (186181064).

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

133431040 is an equidigital number, since it uses as much as digits as its factorization.

133431040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104264 (or 104250 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 133431040 is about 11551.2354317623. The cubic root of 133431040 is about 510.9977136934.

Adding to 133431040 its reverse (40134331), we get a palindrome (173565371).

The spelling of 133431040 in words is "one hundred thirty-three million, four hundred thirty-one thousand, forty".