133504638 has 16 divisors (see below), whose sum is σ = 282715920. Its totient is φ = 41883776.

The previous prime is 133504633. The next prime is 133504681. The reversal of 133504638 is 836405331.

It is a super-2 number, since 2×133504638² = 35646976735022088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133504599 and 133504608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133504633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654333 + ... + 654536.

It is an arithmetic number, because the mean of its divisors is an integer number (17669745).

Almost surely, 2^133504638 is an apocalyptic number.

133504638 is an abundant number, since it is smaller than the sum of its proper divisors (149211282).

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

133504638 is a wasteful number, since it uses less digits than its factorization.

133504638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308891.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 133504638 is about 11554.4207124373. The cubic root of 133504638 is about 511.0916486008.

Adding to 133504638 its reverse (836405331), we get a palindrome (969909969).

The spelling of 133504638 in words is "one hundred thirty-three million, five hundred four thousand, six hundred thirty-eight".