6891390 has 48 divisors (see below), whose sum is σ = 19549296. Its totient is φ = 1670400.

The previous prime is 6891383. The next prime is 6891413. The reversal of 6891390 is 931986.

6891390 = 1172² + 1173² + ... + 1176².

It is a super-2 number, since 2×6891390² = 94982512264200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2491 + ... + 4470.

It is an arithmetic number, because the mean of its divisors is an integer number (407277).

Almost surely, 2^6891390 is an apocalyptic number.

6891390 is an abundant number, since it is smaller than the sum of its proper divisors (12657906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6891390 is a wasteful number, since it uses less digits than its factorization.

6891390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6985 (or 6982 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 6891390 is about 2625.1457102416. The cubic root of 6891390 is about 190.2986070973.

The spelling of 6891390 in words is "six million, eight hundred ninety-one thousand, three hundred ninety".