33138978 has 16 divisors (see below), whose sum is σ = 66382176. Its totient is φ = 11028960.

The previous prime is 33138971. The next prime is 33138991. The reversal of 33138978 is 87983133.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (33138971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150 + ... + 8142.

It is an arithmetic number, because the mean of its divisors is an integer number (4148886).

Almost surely, 2^33138978 is an apocalyptic number.

33138978 is an abundant number, since it is smaller than the sum of its proper divisors (33243198).

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

33138978 is a wasteful number, since it uses less digits than its factorization.

33138978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8689.

The product of its digits is 108864, while the sum is 42.

The square root of 33138978 is about 5756.6464195745. The cubic root of 33138978 is about 321.2030818650.

The spelling of 33138978 in words is "thirty-three million, one hundred thirty-eight thousand, nine hundred seventy-eight".