33639997 has 2 divisors, whose sum is σ = 33639998. Its totient is φ = 33639996.

The previous prime is 33639989. The next prime is 33640003. The reversal of 33639997 is 79993633.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27657081 + 5982916 = 5259^2 + 2446^2 .

It is an emirp because it is prime and its reverse (79993633) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33639997 - 2³ = 33639989 is a prime.

It is a super-2 number, since 2×33639997² = 2263298796320018, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 33639997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33639197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16819998 + 16819999.

It is an arithmetic number, because the mean of its divisors is an integer number (16819999).

Almost surely, 2^33639997 is an apocalyptic number.

It is an amenable number.

33639997 is a deficient number, since it is larger than the sum of its proper divisors (1).

33639997 is an equidigital number, since it uses as much as digits as its factorization.

33639997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 826686, while the sum is 49.

The square root of 33639997 is about 5799.9997413793. Note that the first 3 decimals coincide. The cubic root of 33639997 is about 322.8137187215.

The spelling of 33639997 in words is "thirty-three million, six hundred thirty-nine thousand, nine hundred ninety-seven".