33390209 has 4 divisors (see below), whose sum is σ = 33401940. Its totient is φ = 33378480.

The previous prime is 33390191. The next prime is 33390233. The reversal of 33390209 is 90209333.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90209333 = 5303 ⋅17011.

It can be written as a sum of positive squares in 2 ways, for example, as 13897984 + 19492225 = 3728^2 + 4415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33390209 is a prime.

It is a super-2 number, since 2×33390209² = 2229812114127362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33390299) 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, 1427 + ... + 8295.

It is an arithmetic number, because the mean of its divisors is an integer number (8350485).

Almost surely, 2^33390209 is an apocalyptic number.

It is an amenable number.

33390209 is a deficient number, since it is larger than the sum of its proper divisors (11731).

33390209 is an equidigital number, since it uses as much as digits as its factorization.

33390209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11730.

The product of its (nonzero) digits is 4374, while the sum is 29.

The square root of 33390209 is about 5778.4261698148. The cubic root of 33390209 is about 322.0127337016.

The spelling of 33390209 in words is "thirty-three million, three hundred ninety thousand, two hundred nine".