6881390 has 8 divisors (see below), whose sum is σ = 12386520. Its totient is φ = 2752552.

The previous prime is 6881389. The next prime is 6881417. The reversal of 6881390 is 931886.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6881390.

It is a congruent 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, 344060 + ... + 344079.

It is an arithmetic number, because the mean of its divisors is an integer number (1548315).

Almost surely, 2^6881390 is an apocalyptic number.

6881390 is a deficient number, since it is larger than the sum of its proper divisors (5505130).

6881390 is a wasteful number, since it uses less digits than its factorization.

6881390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688146.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 6881390 is about 2623.2403626050. The cubic root of 6881390 is about 190.2065159866.

The spelling of 6881390 in words is "six million, eight hundred eighty-one thousand, three hundred ninety".