33638421 has 8 divisors (see below), whose sum is σ = 45148864. Its totient is φ = 22276800.

The previous prime is 33638413. The next prime is 33638431. The reversal of 33638421 is 12483633.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33638421 - 2³ = 33638413 is a prime.

It is a super-2 number, since 2×33638421² = 2263086734746482, 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 (33638431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36676 + ... + 37581.

It is an arithmetic number, because the mean of its divisors is an integer number (5643608).

Almost surely, 2^33638421 is an apocalyptic number.

It is an amenable number.

33638421 is a deficient number, since it is larger than the sum of its proper divisors (11510443).

33638421 is a wasteful number, since it uses less digits than its factorization.

33638421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74411.

The product of its digits is 10368, while the sum is 30.

The square root of 33638421 is about 5799.8638777130. The cubic root of 33638421 is about 322.8086774768.

The spelling of 33638421 in words is "thirty-three million, six hundred thirty-eight thousand, four hundred twenty-one".