133688418 has 8 divisors (see below), whose sum is σ = 267376848. Its totient is φ = 44562804.

The previous prime is 133688381. The next prime is 133688431. The reversal of 133688418 is 814886331.

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

133688418 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 133688418.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11140696 + ... + 11140707.

It is an arithmetic number, because the mean of its divisors is an integer number (33422106).

Almost surely, 2^133688418 is an apocalyptic number.

133688418 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

133688418 is a wasteful number, since it uses less digits than its factorization.

133688418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22281408.

The product of its digits is 110592, while the sum is 42.

The square root of 133688418 is about 11562.3707776563. The cubic root of 133688418 is about 511.3260608216.

It can be divided in two parts, 133 and 688418, that added together give a triangular number (688551 = T₁₁₇₃).

The spelling of 133688418 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, four hundred eighteen".