133957520 has 80 divisors (see below), whose sum is σ = 332121600. Its totient is φ = 50130432.

The previous prime is 133957519. The next prime is 133957529. The reversal of 133957520 is 25759331.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (133957529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85706 + ... + 87254.

It is an arithmetic number, because the mean of its divisors is an integer number (4151520).

Almost surely, 2^133957520 is an apocalyptic number.

133957520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133957520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166060800).

133957520 is an abundant number, since it is smaller than the sum of its proper divisors (198164080).

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

133957520 is a wasteful number, since it uses less digits than its factorization.

133957520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 133957520 is about 11574.0019008120. The cubic root of 133957520 is about 511.6689143671.

The spelling of 133957520 in words is "one hundred thirty-three million, nine hundred fifty-seven thousand, five hundred twenty".