133801638 has 16 divisors (see below), whose sum is σ = 273827136. Its totient is φ = 43563240.

The previous prime is 133801637. The next prime is 133801639. The reversal of 133801638 is 836108331.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (133801637) and next prime (133801639).

It is a super-3 number, since 3×133801638³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133801599 and 133801608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133801631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259048 + ... + 259563.

It is an arithmetic number, because the mean of its divisors is an integer number (17114196).

Almost surely, 2^133801638 is an apocalyptic number.

133801638 is an abundant number, since it is smaller than the sum of its proper divisors (140025498).

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

133801638 is a wasteful number, since it uses less digits than its factorization.

133801638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518659.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 133801638 is about 11567.2657962027. The cubic root of 133801638 is about 511.4703665196.

Adding to 133801638 its reverse (836108331), we get a palindrome (969909969).

The spelling of 133801638 in words is "one hundred thirty-three million, eight hundred one thousand, six hundred thirty-eight".