133639738 has 8 divisors (see below), whose sum is σ = 201205620. Its totient is φ = 66571200.

The previous prime is 133639733. The next prime is 133639757. The reversal of 133639738 is 837936331.

133639738 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 107599129 + 26040609 = 10373^2 + 5103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 133639694 and 133639703.

It is not an unprimeable number, because it can be changed into a prime (133639733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123663 + ... + 124738.

Almost surely, 2^133639738 is an apocalyptic number.

133639738 is a deficient number, since it is larger than the sum of its proper divisors (67565882).

133639738 is a wasteful number, since it uses less digits than its factorization.

133639738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248672.

The product of its digits is 244944, while the sum is 43.

The square root of 133639738 is about 11560.2654813806. The cubic root of 133639738 is about 511.2639901879.

The spelling of 133639738 in words is "one hundred thirty-three million, six hundred thirty-nine thousand, seven hundred thirty-eight".