133304240 has 20 divisors (see below), whose sum is σ = 309932544. Its totient is φ = 53321664.

The previous prime is 133304233. The next prime is 133304261. The reversal of 133304240 is 42403331.

It is a tau number, because it is divible by the number of its divisors (20).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833072 + ... + 833231.

Almost surely, 2^133304240 is an apocalyptic number.

133304240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133304240 is an abundant number, since it is smaller than the sum of its proper divisors (176628304).

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

133304240 is a wasteful number, since it uses less digits than its factorization.

133304240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666316 (or 1666310 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 133304240 is about 11545.7455367767. The cubic root of 133304240 is about 510.8357947332.

Adding to 133304240 its reverse (42403331), we get a palindrome (175707571).

Subtracting from 133304240 its reverse (42403331), we obtain a palindrome (90900909).

The spelling of 133304240 in words is "one hundred thirty-three million, three hundred four thousand, two hundred forty".