33642989 has 4 divisors (see below), whose sum is σ = 33791424. Its totient is φ = 33494556.

The previous prime is 33642943. The next prime is 33642991. The reversal of 33642989 is 98924633.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 33642989 - 2²⁰ = 32594413 is a prime.

It is a super-2 number, since 2×33642989² = 2263701417708242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33642589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73877 + ... + 74330.

It is an arithmetic number, because the mean of its divisors is an integer number (8447856).

Almost surely, 2^33642989 is an apocalyptic number.

It is an amenable number.

33642989 is a deficient number, since it is larger than the sum of its proper divisors (148435).

33642989 is a wasteful number, since it uses less digits than its factorization.

33642989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148434.

The product of its digits is 279936, while the sum is 44.

The square root of 33642989 is about 5800.2576666903. The cubic root of 33642989 is about 322.8232889761.

The spelling of 33642989 in words is "thirty-three million, six hundred forty-two thousand, nine hundred eighty-nine".