5638421 has 8 divisors (see below), whose sum is σ = 5974080. Its totient is φ = 5306688.

The previous prime is 5638411. The next prime is 5638429. The reversal of 5638421 is 1248365.

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

It is a cyclic number.

It is not a de Polignac number, because 5638421 - 2⁶ = 5638357 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5638429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2285 + ... + 4061.

It is an arithmetic number, because the mean of its divisors is an integer number (746760).

Almost surely, 2^5638421 is an apocalyptic number.

It is an amenable number.

5638421 is a deficient number, since it is larger than the sum of its proper divisors (335659).

5638421 is a wasteful number, since it uses less digits than its factorization.

5638421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963.

The product of its digits is 5760, while the sum is 29.

The square root of 5638421 is about 2374.5359546657. The cubic root of 5638421 is about 177.9859960367.

The spelling of 5638421 in words is "five million, six hundred thirty-eight thousand, four hundred twenty-one".