6858421 has 4 divisors (see below), whose sum is σ = 6872992. Its totient is φ = 6843852.

The previous prime is 6858407. The next prime is 6858427. The reversal of 6858421 is 1248586.

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 6858421 - 2¹³ = 6850229 is a prime.

It is a super-2 number, since 2×6858421² = 94075877226482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6858427) 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, 6555 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (1718248).

Almost surely, 2^6858421 is an apocalyptic number.

It is an amenable number.

6858421 is a deficient number, since it is larger than the sum of its proper divisors (14571).

6858421 is a wasteful number, since it uses less digits than its factorization.

6858421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14570.

The product of its digits is 15360, while the sum is 34.

The square root of 6858421 is about 2618.8587208935. The cubic root of 6858421 is about 189.9946535892.

The spelling of 6858421 in words is "six million, eight hundred fifty-eight thousand, four hundred twenty-one".