133438839 has 8 divisors (see below), whose sum is σ = 177998592. Its totient is φ = 88919160.

The previous prime is 133438829. The next prime is 133438859. The reversal of 133438839 is 938834331.

It is a happy number.

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

It is not a de Polignac number, because 133438839 - 2⁵ = 133438807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133438839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133438829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1117 + ... + 16374.

It is an arithmetic number, because the mean of its divisors is an integer number (22249824).

Almost surely, 2^133438839 is an apocalyptic number.

133438839 is a deficient number, since it is larger than the sum of its proper divisors (44559753).

133438839 is a wasteful number, since it uses less digits than its factorization.

133438839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20037.

The product of its digits is 186624, while the sum is 42.

The square root of 133438839 is about 11551.5730097680. The cubic root of 133438839 is about 511.0076693817.

The spelling of 133438839 in words is "one hundred thirty-three million, four hundred thirty-eight thousand, eight hundred thirty-nine".