133621240 has 16 divisors (see below), whose sum is σ = 300647880. Its totient is φ = 53448480.

The previous prime is 133621211. The next prime is 133621261. The reversal of 133621240 is 42126331.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670226 + ... + 1670305.

Almost surely, 2^133621240 is an apocalyptic number.

133621240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133621240 is an abundant number, since it is smaller than the sum of its proper divisors (167026640).

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

133621240 is a wasteful number, since it uses less digits than its factorization.

133621240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340542 (or 3340538 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 133621240 is about 11559.4653855617. The cubic root of 133621240 is about 511.2403999050.

Adding to 133621240 its reverse (42126331), we get a palindrome (175747571).

The spelling of 133621240 in words is "one hundred thirty-three million, six hundred twenty-one thousand, two hundred forty".