7981667 has 8 divisors (see below), whose sum is σ = 8466720. Its totient is φ = 7508160.

The previous prime is 7981661. The next prime is 7981711. The reversal of 7981667 is 7661897.

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

It is a cyclic number.

It is not a de Polignac number, because 7981667 - 2⁸ = 7981411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1442 + ... + 4247.

It is an arithmetic number, because the mean of its divisors is an integer number (1058340).

Almost surely, 2^7981667 is an apocalyptic number.

7981667 is a deficient number, since it is larger than the sum of its proper divisors (485053).

7981667 is a wasteful number, since it uses less digits than its factorization.

7981667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5773.

The product of its digits is 127008, while the sum is 44.

The square root of 7981667 is about 2825.1844187592. The cubic root of 7981667 is about 199.8471081502.

The spelling of 7981667 in words is "seven million, nine hundred eighty-one thousand, six hundred sixty-seven".