33947213 has 4 divisors (see below), whose sum is σ = 34054620. Its totient is φ = 33839808.

The previous prime is 33947203. The next prime is 33947233. The reversal of 33947213 is 31274933.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31274933 = 4889 ⋅6397.

It can be written as a sum of positive squares in 2 ways, for example, as 2553604 + 31393609 = 1598^2 + 5603^2 .

It is a cyclic number.

It is not a de Polignac number, because 33947213 - 2¹⁰ = 33946189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33947213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33947203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53228 + ... + 53861.

It is an arithmetic number, because the mean of its divisors is an integer number (8513655).

Almost surely, 2^33947213 is an apocalyptic number.

It is an amenable number.

33947213 is a deficient number, since it is larger than the sum of its proper divisors (107407).

33947213 is a wasteful number, since it uses less digits than its factorization.

33947213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107406.

The product of its digits is 13608, while the sum is 32.

The square root of 33947213 is about 5826.4236886790. The cubic root of 33947213 is about 323.7934370245.

The spelling of 33947213 in words is "thirty-three million, nine hundred forty-seven thousand, two hundred thirteen".