731806 has 4 divisors (see below), whose sum is σ = 1097712. Its totient is φ = 365902.

The previous prime is 731803. The next prime is 731807. The reversal of 731806 is 608137.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 608137 = 89 ⋅6833.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182950 + ... + 182953.

It is an arithmetic number, because the mean of its divisors is an integer number (274428).

2⁷³¹⁸⁰⁶ is an apocalyptic number.

731806 is a deficient number, since it is larger than the sum of its proper divisors (365906).

731806 is a wasteful number, since it uses less digits than its factorization.

731806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365905.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 731806 is about 855.4566032243. The cubic root of 731806 is about 90.1153254107.

It can be divided in two parts, 7 and 31806, that added together give a palindrome (31813).

The spelling of 731806 in words is "seven hundred thirty-one thousand, eight hundred six".