33942409 has 2 divisors, whose sum is σ = 33942410. Its totient is φ = 33942408.

The previous prime is 33942407. The next prime is 33942443. The reversal of 33942409 is 90424933.

It is an a-pointer prime, because the next prime (33942443) can be obtained adding 33942409 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 3250809 = 5540^2 + 1803^2 .

It is a cyclic number.

It is not a de Polignac number, because 33942409 - 2¹ = 33942407 is a prime.

Together with 33942407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (33942407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16971204 + 16971205.

It is an arithmetic number, because the mean of its divisors is an integer number (16971205).

Almost surely, 2^33942409 is an apocalyptic number.

It is an amenable number.

33942409 is a deficient number, since it is larger than the sum of its proper divisors (1).

33942409 is an equidigital number, since it uses as much as digits as its factorization.

33942409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 33942409 is about 5826.0114143383. The cubic root of 33942409 is about 323.7781625546.

The spelling of 33942409 in words is "thirty-three million, nine hundred forty-two thousand, four hundred nine".