133435840 has 56 divisors (see below), whose sum is σ = 318759840. Its totient is φ = 53203968.

The previous prime is 133435829. The next prime is 133435843. The reversal of 133435840 is 48534331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133435843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160546 + ... + 161374.

It is an arithmetic number, because the mean of its divisors is an integer number (5692140).

Almost surely, 2^133435840 is an apocalyptic number.

133435840 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 133435840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159379920).

133435840 is an abundant number, since it is smaller than the sum of its proper divisors (185324000).

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

133435840 is an equidigital number, since it uses as much as digits as its factorization.

133435840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349 (or 1339 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 133435840 is about 11551.4431998777. The cubic root of 133435840 is about 511.0038411023.

The spelling of 133435840 in words is "one hundred thirty-three million, four hundred thirty-five thousand, eight hundred forty".