33729989 has 4 divisors (see below), whose sum is σ = 35714124. Its totient is φ = 31745856.

The previous prime is 33729979. The next prime is 33729991. The reversal of 33729989 is 98992733.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98992733 = 7 ⋅14141819.

It can be written as a sum of positive squares in 2 ways, for example, as 29789764 + 3940225 = 5458^2 + 1985^2 .

It is a cyclic number.

It is not a de Polignac number, because 33729989 - 2⁸ = 33729733 is a prime.

It is a super-2 number, since 2×33729989² = 2275424315880242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33729979) 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 in 3 ways as a sum of consecutive naturals, for example, 992042 + ... + 992075.

It is an arithmetic number, because the mean of its divisors is an integer number (8928531).

Almost surely, 2^33729989 is an apocalyptic number.

It is an amenable number.

33729989 is a deficient number, since it is larger than the sum of its proper divisors (1984135).

33729989 is a wasteful number, since it uses less digits than its factorization.

33729989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984134.

The product of its digits is 734832, while the sum is 50.

The square root of 33729989 is about 5807.7524912827. The cubic root of 33729989 is about 323.1013206661.

The spelling of 33729989 in words is "thirty-three million, seven hundred twenty-nine thousand, nine hundred eighty-nine".