5678921 has 4 divisors (see below), whose sum is σ = 5862144. Its totient is φ = 5495700.

The previous prime is 5678903. The next prime is 5678923. The reversal of 5678921 is 1298765.

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 5678921 - 2¹⁰ = 5677897 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5678923) 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, 91565 + ... + 91626.

It is an arithmetic number, because the mean of its divisors is an integer number (1465536).

Almost surely, 2^5678921 is an apocalyptic number.

It is an amenable number.

5678921 is a deficient number, since it is larger than the sum of its proper divisors (183223).

5678921 is a wasteful number, since it uses less digits than its factorization.

5678921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183222.

The product of its digits is 30240, while the sum is 38.

The square root of 5678921 is about 2383.0486776396. The cubic root of 5678921 is about 178.4111293807.

The spelling of 5678921 in words is "five million, six hundred seventy-eight thousand, nine hundred twenty-one".