863890173 has 12 divisors (see below), whose sum is σ = 1321244028. Its totient is φ = 542048640.

The previous prime is 863890169. The next prime is 863890199. The reversal of 863890173 is 371098368.

It is a happy number.

863890173 is a `hidden beast` number, since 8 + 638 + 9 + 0 + 1 + 7 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 251476164 + 612414009 = 15858^2 + 24747^2 .

It is not a de Polignac number, because 863890173 - 2² = 863890169 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863890133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2823018 + ... + 2823323.

It is an arithmetic number, because the mean of its divisors is an integer number (110103669).

Almost surely, 2^863890173 is an apocalyptic number.

It is an amenable number.

863890173 is a deficient number, since it is larger than the sum of its proper divisors (457353855).

863890173 is a wasteful number, since it uses less digits than its factorization.

863890173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5646364 (or 5646361 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 863890173 is about 29392.0086588175. The cubic root of 863890173 is about 952.4002731062.

The spelling of 863890173 in words is "eight hundred sixty-three million, eight hundred ninety thousand, one hundred seventy-three".