8161904 has 40 divisors (see below), whose sum is σ = 17217648. Its totient is φ = 3732480.

The previous prime is 8161903. The next prime is 8161913. The reversal of 8161904 is 4091618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9659 + ... + 10469.

Almost surely, 2^8161904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8161904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8608824).

8161904 is an abundant number, since it is smaller than the sum of its proper divisors (9055744).

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

8161904 is a wasteful number, since it uses less digits than its factorization.

8161904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 8161904 is about 2856.9046186389. The cubic root of 8161904 is about 201.3401992698.

The spelling of 8161904 in words is "eight million, one hundred sixty-one thousand, nine hundred four".