33388945 has 4 divisors (see below), whose sum is σ = 40066740. Its totient is φ = 26711152.

The previous prime is 33388933. The next prime is 33388951. The reversal of 33388945 is 54988333.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54988333 = 127 ⋅432979.

It can be written as a sum of positive squares in 2 ways, for example, as 10233601 + 23155344 = 3199^2 + 4812^2 .

It is a cyclic number.

It is not a de Polignac number, because 33388945 - 2¹¹ = 33386897 is a prime.

It is a super-2 number, since 2×33388945² = 2229643296426050, which contains 22 as substring.

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, 3338890 + ... + 3338899.

It is an arithmetic number, because the mean of its divisors is an integer number (10016685).

Almost surely, 2^33388945 is an apocalyptic number.

It is an amenable number.

33388945 is a deficient number, since it is larger than the sum of its proper divisors (6677795).

33388945 is an equidigital number, since it uses as much as digits as its factorization.

33388945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6677794.

The product of its digits is 311040, while the sum is 43.

The square root of 33388945 is about 5778.3167964382. The cubic root of 33388945 is about 322.0086703425.

The spelling of 33388945 in words is "thirty-three million, three hundred eighty-eight thousand, nine hundred forty-five".