5639921 has 4 divisors (see below), whose sum is σ = 6445632. Its totient is φ = 4834212.

The previous prime is 5639867. The next prime is 5639927. The reversal of 5639921 is 1299365.

5639921 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

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 5639921 - 2⁶ = 5639857 is a prime.

It is a Duffinian number.

5639921 is strictly pandigital in base 8.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5639927) 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, 402845 + ... + 402858.

It is an arithmetic number, because the mean of its divisors is an integer number (1611408).

Almost surely, 2^5639921 is an apocalyptic number.

It is an amenable number.

5639921 is a deficient number, since it is larger than the sum of its proper divisors (805711).

5639921 is an equidigital number, since it uses as much as digits as its factorization.

5639921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805710.

The product of its digits is 14580, while the sum is 35.

The square root of 5639921 is about 2374.8517848489. The cubic root of 5639921 is about 178.0017779564.

The spelling of 5639921 in words is "five million, six hundred thirty-nine thousand, nine hundred twenty-one".