6856490 has 8 divisors (see below), whose sum is σ = 12341700. Its totient is φ = 2742592.

The previous prime is 6856483. The next prime is 6856517. The reversal of 6856490 is 946586.

It can be written as a sum of positive squares in 2 ways, for example, as 5909761 + 946729 = 2431^2 + 973^2 .

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

It is a super-2 number, since 2×6856490² = 94022910240200, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342815 + ... + 342834.

Almost surely, 2^6856490 is an apocalyptic number.

6856490 is a deficient number, since it is larger than the sum of its proper divisors (5485210).

6856490 is a wasteful number, since it uses less digits than its factorization.

6856490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685656.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6856490 is about 2618.4900228949. The cubic root of 6856490 is about 189.9768208104.

The spelling of 6856490 in words is "six million, eight hundred fifty-six thousand, four hundred ninety".