33997409 has 2 divisors, whose sum is σ = 33997410. Its totient is φ = 33997408.

The previous prime is 33997387. The next prime is 33997423. The reversal of 33997409 is 90479933.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 183184 = 5815^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 33997409 - 2¹² = 33993313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 33997409.

It is not a weakly prime, because it can be changed into another prime (33997429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16998704 + 16998705.

It is an arithmetic number, because the mean of its divisors is an integer number (16998705).

Almost surely, 2^33997409 is an apocalyptic number.

It is an amenable number.

33997409 is a deficient number, since it is larger than the sum of its proper divisors (1).

33997409 is an equidigital number, since it uses as much as digits as its factorization.

33997409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 33997409 is about 5830.7297141953. The cubic root of 33997409 is about 323.9529506695.

The spelling of 33997409 in words is "thirty-three million, nine hundred ninety-seven thousand, four hundred nine".