7981904 has 30 divisors (see below), whose sum is σ = 17991594. Its totient is φ = 3420480.

The previous prime is 7981889. The next prime is 7981907. The reversal of 7981904 is 4091897.

It can be written as a sum of positive squares in only one way, i.e., 7075600 + 906304 = 2660^2 + 952^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7981907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4307 + ... + 5874.

Almost surely, 2^7981904 is an apocalyptic number.

It is an amenable number.

7981904 is an abundant number, since it is smaller than the sum of its proper divisors (10009690).

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

7981904 is a wasteful number, since it uses less digits than its factorization.

7981904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203 (or 10190 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7981904 is about 2825.2263626124. The cubic root of 7981904 is about 199.8490861537.

The spelling of 7981904 in words is "seven million, nine hundred eighty-one thousand, nine hundred four".