8143640 has 16 divisors (see below), whose sum is σ = 18323280. Its totient is φ = 3257440.

The previous prime is 8143637. The next prime is 8143651. The reversal of 8143640 is 463418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101756 + ... + 101835.

It is an arithmetic number, because the mean of its divisors is an integer number (1145205).

Almost surely, 2^8143640 is an apocalyptic number.

It is an amenable number.

8143640 is an abundant number, since it is smaller than the sum of its proper divisors (10179640).

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

8143640 is a wasteful number, since it uses less digits than its factorization.

8143640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203602 (or 203598 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 8143640 is about 2853.7063619090. The cubic root of 8143640 is about 201.1899065721.

The spelling of 8143640 in words is "eight million, one hundred forty-three thousand, six hundred forty".