133253988 has 48 divisors (see below), whose sum is σ = 358170624. Its totient is φ = 37769760.

The previous prime is 133253971. The next prime is 133253993. The reversal of 133253988 is 889352331.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4423 + ... + 16913.

It is an arithmetic number, because the mean of its divisors is an integer number (7461888).

Almost surely, 2^133253988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133253988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179085312).

133253988 is an abundant number, since it is smaller than the sum of its proper divisors (224916636).

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

133253988 is a wasteful number, since it uses less digits than its factorization.

133253988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632 (or 12630 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 133253988 is about 11543.5691187778. The cubic root of 133253988 is about 510.7715963583.

The spelling of 133253988 in words is "one hundred thirty-three million, two hundred fifty-three thousand, nine hundred eighty-eight".