8161980 has 24 divisors (see below), whose sum is σ = 22853712. Its totient is φ = 2176512.

The previous prime is 8161969. The next prime is 8161981. The reversal of 8161980 is 891618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161981) 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, 67957 + ... + 68076.

It is an arithmetic number, because the mean of its divisors is an integer number (952238).

Almost surely, 2^8161980 is an apocalyptic number.

It is an amenable number.

8161980 is an abundant number, since it is smaller than the sum of its proper divisors (14691732).

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

8161980 is a wasteful number, since it uses less digits than its factorization.

8161980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136045 (or 136043 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 8161980 is about 2856.9179197170. The cubic root of 8161980 is about 201.3408241978.

The spelling of 8161980 in words is "eight million, one hundred sixty-one thousand, nine hundred eighty".