133145424 has 80 divisors (see below), whose sum is σ = 386582400. Its totient is φ = 43870464.

The previous prime is 133145423. The next prime is 133145449. The reversal of 133145424 is 424541331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133145423) 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, 36717 + ... + 40179.

It is an arithmetic number, because the mean of its divisors is an integer number (4832280).

Almost surely, 2^133145424 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 133145424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193291200).

133145424 is an abundant number, since it is smaller than the sum of its proper divisors (253436976).

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

133145424 is a wasteful number, since it uses less digits than its factorization.

133145424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3569 (or 3557 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 133145424 is about 11538.8658021488. The cubic root of 133145424 is about 510.6328476067.

Adding to 133145424 its reverse (424541331), we get a palindrome (557686755).

The spelling of 133145424 in words is "one hundred thirty-three million, one hundred forty-five thousand, four hundred twenty-four".