731863 has 4 divisors (see below), whose sum is σ = 798408. Its totient is φ = 665320.

The previous prime is 731851. The next prime is 731869. The reversal of 731863 is 368137.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 731863 - 2⁵ = 731831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33256 + ... + 33277.

It is an arithmetic number, because the mean of its divisors is an integer number (199602).

2⁷³¹⁸⁶³ is an apocalyptic number.

731863 is a deficient number, since it is larger than the sum of its proper divisors (66545).

731863 is a wasteful number, since it uses less digits than its factorization.

731863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66544.

The product of its digits is 3024, while the sum is 28.

The square root of 731863 is about 855.4899181171. The cubic root of 731863 is about 90.1176650290.

It can be divided in two parts, 7318 and 63, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 731863 in words is "seven hundred thirty-one thousand, eight hundred sixty-three".