33172986 has 64 divisors (see below), whose sum is σ = 84188160. Its totient is φ = 8463360.

The previous prime is 33172943. The next prime is 33173003. The reversal of 33172986 is 68927133.

It is a super-2 number, since 2×33172986² = 2200894000312392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26650 + ... + 27866.

It is an arithmetic number, because the mean of its divisors is an integer number (1315440).

Almost surely, 2^33172986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33172986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42094080).

33172986 is an abundant number, since it is smaller than the sum of its proper divisors (51015174).

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

33172986 is a wasteful number, since it uses less digits than its factorization.

33172986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its digits is 54432, while the sum is 39.

The square root of 33172986 is about 5759.5994652406. The cubic root of 33172986 is about 321.3129196909.

The spelling of 33172986 in words is "thirty-three million, one hundred seventy-two thousand, nine hundred eighty-six".