6981890 has 16 divisors (see below), whose sum is σ = 12874680. Its totient is φ = 2724480.

The previous prime is 6981889. The next prime is 6981943. The reversal of 6981890 is 981896.

It can be written as a sum of positive squares in 4 ways, for example, as 4853209 + 2128681 = 2203^2 + 1459^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8105 + ... + 8924.

Almost surely, 2^6981890 is an apocalyptic number.

6981890 is a deficient number, since it is larger than the sum of its proper divisors (5892790).

6981890 is a wasteful number, since it uses less digits than its factorization.

6981890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17077.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 6981890 is about 2642.3266262898. The cubic root of 6981890 is about 191.1280082660.

The spelling of 6981890 in words is "six million, nine hundred eighty-one thousand, eight hundred ninety".