102805143 has 16 divisors (see below), whose sum is σ = 164901120. Its totient is φ = 55653696.

The previous prime is 102805139. The next prime is 102805169. The reversal of 102805143 is 341508201.

It is not a de Polignac number, because 102805143 - 2² = 102805139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102805123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128430 + ... + 129227.

It is an arithmetic number, because the mean of its divisors is an integer number (10306320).

Almost surely, 2^102805143 is an apocalyptic number.

102805143 is a deficient number, since it is larger than the sum of its proper divisors (62095977).

102805143 is a wasteful number, since it uses less digits than its factorization.

102805143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257686.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 102805143 is about 10139.2871051174. The cubic root of 102805143 is about 468.4590289494.

The spelling of 102805143 in words is "one hundred two million, eight hundred five thousand, one hundred forty-three".