133405040 has 40 divisors (see below), whose sum is σ = 314808720. Its totient is φ = 52563456.

The previous prime is 133405039. The next prime is 133405043. The reversal of 133405040 is 40504331.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133405043) 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, 7085 + ... + 17804.

It is an arithmetic number, because the mean of its divisors is an integer number (7870218).

Almost surely, 2^133405040 is an apocalyptic number.

133405040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133405040 is an abundant number, since it is smaller than the sum of its proper divisors (181403680).

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

133405040 is a wasteful number, since it uses less digits than its factorization.

133405040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24969 (or 24963 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 133405040 is about 11550.1099561866. The cubic root of 133405040 is about 510.9645210080.

Adding to 133405040 its reverse (40504331), we get a palindrome (173909371).

The spelling of 133405040 in words is "one hundred thirty-three million, four hundred five thousand, forty".