133523440 has 40 divisors (see below), whose sum is σ = 328706640. Its totient is φ = 50267136.

The previous prime is 133523419. The next prime is 133523459. The reversal of 133523440 is 44325331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47730 + ... + 50449.

It is an arithmetic number, because the mean of its divisors is an integer number (8217666).

Almost surely, 2^133523440 is an apocalyptic number.

133523440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133523440 is an abundant number, since it is smaller than the sum of its proper divisors (195183200).

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

133523440 is a wasteful number, since it uses less digits than its factorization.

133523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98209 (or 98203 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 133523440 is about 11555.2343117740. The cubic root of 133523440 is about 511.1156405116.

Adding to 133523440 its reverse (44325331), we get a palindrome (177848771).

The spelling of 133523440 in words is "one hundred thirty-three million, five hundred twenty-three thousand, four hundred forty".