133551840 has 48 divisors (see below), whose sum is σ = 420689808. Its totient is φ = 35613696.

The previous prime is 133551793. The next prime is 133551841. The reversal of 133551840 is 48155331.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 133551798 and 133551807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133551841) 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 7 ways as a sum of consecutive naturals, for example, 138637 + ... + 139596.

It is an arithmetic number, because the mean of its divisors is an integer number (8764371).

Almost surely, 2^133551840 is an apocalyptic number.

133551840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133551840 is an abundant number, since it is smaller than the sum of its proper divisors (287137968).

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

133551840 is a wasteful number, since it uses less digits than its factorization.

133551840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278251 (or 278243 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 133551840 is about 11556.4631267529. The cubic root of 133551840 is about 511.1518754857.

The spelling of 133551840 in words is "one hundred thirty-three million, five hundred fifty-one thousand, eight hundred forty".