33942809 has 2 divisors, whose sum is σ = 33942810. Its totient is φ = 33942808.

The previous prime is 33942791. The next prime is 33942823. The reversal of 33942809 is 90824933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25532809 + 8410000 = 5053^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 33942809 - 2¹² = 33938713 is a prime.

It is a super-2 number, since 2×33942809² = 2304228565620962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33942859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16971404 + 16971405.

It is an arithmetic number, because the mean of its divisors is an integer number (16971405).

Almost surely, 2^33942809 is an apocalyptic number.

It is an amenable number.

33942809 is a deficient number, since it is larger than the sum of its proper divisors (1).

33942809 is an equidigital number, since it uses as much as digits as its factorization.

33942809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 33942809 is about 5826.0457430405. The cubic root of 33942809 is about 323.7794344223.

The spelling of 33942809 in words is "thirty-three million, nine hundred forty-two thousand, eight hundred nine".