7681986 has 64 divisors (see below), whose sum is σ = 19031040. Its totient is φ = 2280960.

The previous prime is 7681969. The next prime is 7681991. The reversal of 7681986 is 6891867.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21586 + ... + 21938.

It is an arithmetic number, because the mean of its divisors is an integer number (297360).

Almost surely, 2^7681986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7681986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9515520).

7681986 is an abundant number, since it is smaller than the sum of its proper divisors (11349054).

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

7681986 is a wasteful number, since it uses less digits than its factorization.

7681986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 402 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 7681986 is about 2771.6395869593. The cubic root of 7681986 is about 197.3139710681.

The spelling of 7681986 in words is "seven million, six hundred eighty-one thousand, nine hundred eighty-six".