133218426 has 64 divisors (see below), whose sum is σ = 316172160. Its totient is φ = 36956160.

The previous prime is 133218419. The next prime is 133218427. The reversal of 133218426 is 624812331.

It is a junction number, because it is equal to n+sod(n) for n = 133218393 and 133218402.

It is not an unprimeable number, because it can be changed into a prime (133218427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39910 + ... + 43118.

It is an arithmetic number, because the mean of its divisors is an integer number (4940190).

Almost surely, 2^133218426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133218426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158086080).

133218426 is an abundant number, since it is smaller than the sum of its proper divisors (182953734).

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

133218426 is a wasteful number, since it uses less digits than its factorization.

133218426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279.

The product of its digits is 6912, while the sum is 30.

The square root of 133218426 is about 11542.0286778365. The cubic root of 133218426 is about 510.7261551277.

The spelling of 133218426 in words is "one hundred thirty-three million, two hundred eighteen thousand, four hundred twenty-six".