133236240 has 80 divisors (see below), whose sum is σ = 431008128. Its totient is φ = 33983488.

The previous prime is 133236239. The next prime is 133236241. The reversal of 133236240 is 42632331.

It is an interprime number because it is at equal distance from previous prime (133236239) and next prime (133236241).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 133236240.

It is not an unprimeable number, because it can be changed into a prime (133236241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6549 + ... + 17588.

Almost surely, 2^133236240 is an apocalyptic number.

133236240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133236240 is an abundant number, since it is smaller than the sum of its proper divisors (297771888).

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

133236240 is a wasteful number, since it uses less digits than its factorization.

133236240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24176 (or 24170 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 133236240 is about 11542.8003534671. The cubic root of 133236240 is about 510.7489189212.

Adding to 133236240 its reverse (42632331), we get a palindrome (175868571).

The spelling of 133236240 in words is "one hundred thirty-three million, two hundred thirty-six thousand, two hundred forty".