133240520 has 32 divisors (see below), whose sum is σ = 342619200. Its totient is φ = 45682368.

The previous prime is 133240519. The next prime is 133240537. The reversal of 133240520 is 25042331.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 133240492 and 133240501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237650 + ... + 238209.

It is an arithmetic number, because the mean of its divisors is an integer number (10706850).

Almost surely, 2^133240520 is an apocalyptic number.

133240520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133240520 is an abundant number, since it is smaller than the sum of its proper divisors (209378680).

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

133240520 is a wasteful number, since it uses less digits than its factorization.

133240520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475877 (or 475873 counting only the distinct ones).

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

The square root of 133240520 is about 11542.9857489300. The cubic root of 133240520 is about 510.7543878586.

Adding to 133240520 its reverse (25042331), we get a palindrome (158282851).

The spelling of 133240520 in words is "one hundred thirty-three million, two hundred forty thousand, five hundred twenty".