133939240 has 16 divisors (see below), whose sum is σ = 301363380. Its totient is φ = 53575680.

The previous prime is 133939199. The next prime is 133939241. The reversal of 133939240 is 42939331.

It can be written as a sum of positive squares in 2 ways, for example, as 128731716 + 5207524 = 11346^2 + 2282^2 .

It is a junction number, because it is equal to n+sod(n) for n = 133939196 and 133939205.

It is not an unprimeable number, because it can be changed into a prime (133939241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1674201 + ... + 1674280.

Almost surely, 2^133939240 is an apocalyptic number.

133939240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133939240 is an abundant number, since it is smaller than the sum of its proper divisors (167424140).

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

133939240 is a wasteful number, since it uses less digits than its factorization.

133939240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348492 (or 3348488 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 133939240 is about 11573.2121729449. The cubic root of 133939240 is about 511.6456389953.

Subtracting from 133939240 its reverse (42939331), we obtain a palindrome (90999909).

The spelling of 133939240 in words is "one hundred thirty-three million, nine hundred thirty-nine thousand, two hundred forty".