133644040 has 16 divisors (see below), whose sum is σ = 300699180. Its totient is φ = 53457600.

The previous prime is 133644031. The next prime is 133644041. The reversal of 133644040 is 40446331.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 130553476 + 3090564 = 11426^2 + 1758^2 .

It is a junction number, because it is equal to n+sod(n) for n = 133643996 and 133644014.

It is not an unprimeable number, because it can be changed into a prime (133644041) by changing a digit.

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, 1670511 + ... + 1670590.

Almost surely, 2^133644040 is an apocalyptic number.

133644040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133644040 is an abundant number, since it is smaller than the sum of its proper divisors (167055140).

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

133644040 is a wasteful number, since it uses less digits than its factorization.

133644040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341112 (or 3341108 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 133644040 is about 11560.4515482744. The cubic root of 133644040 is about 511.2694761662.

The spelling of 133644040 in words is "one hundred thirty-three million, six hundred forty-four thousand, forty".