8143945 has 8 divisors (see below), whose sum is σ = 9883080. Its totient is φ = 6441600.

The previous prime is 8143939. The next prime is 8143987. The reversal of 8143945 is 5493418.

It can be written as a sum of positive squares in 4 ways, for example, as 259081 + 7884864 = 509^2 + 2808^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8143945 - 2³ = 8143937 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 8143945.

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, 8706 + ... + 9595.

It is an arithmetic number, because the mean of its divisors is an integer number (1235385).

Almost surely, 2^8143945 is an apocalyptic number.

It is an amenable number.

8143945 is a deficient number, since it is larger than the sum of its proper divisors (1739135).

8143945 is a wasteful number, since it uses less digits than its factorization.

8143945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395.

The product of its digits is 17280, while the sum is 34.

The square root of 8143945 is about 2853.7598006840. The cubic root of 8143945 is about 201.1924182317.

The spelling of 8143945 in words is "eight million, one hundred forty-three thousand, nine hundred forty-five".