8561940 has 24 divisors (see below), whose sum is σ = 23973600. Its totient is φ = 2283168.

The previous prime is 8561939. The next prime is 8561953. The reversal of 8561940 is 491658.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71290 + ... + 71409.

It is an arithmetic number, because the mean of its divisors is an integer number (998900).

Almost surely, 2^8561940 is an apocalyptic number.

It is an amenable number.

8561940 is an abundant number, since it is smaller than the sum of its proper divisors (15411660).

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

8561940 is a wasteful number, since it uses less digits than its factorization.

8561940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142711 (or 142709 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 8561940 is about 2926.0792880577. The cubic root of 8561940 is about 204.5772768447.

The spelling of 8561940 in words is "eight million, five hundred sixty-one thousand, nine hundred forty".