731216 has 20 divisors (see below), whose sum is σ = 1479072. Its totient is φ = 349536.

The previous prime is 731209. The next prime is 731219. The reversal of 731216 is 612137.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731219) by changing a digit.

731216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626 + ... + 1361.

2⁷³¹²¹⁶ is an apocalyptic number.

It is an amenable number.

731216 is an abundant number, since it is smaller than the sum of its proper divisors (747856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

731216 is a wasteful number, since it uses less digits than its factorization.

731216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018 (or 2012 counting only the distinct ones).

The product of its digits is 252, while the sum is 20.

The square root of 731216 is about 855.1116886115. Note that the first 3 decimals coincide. The cubic root of 731216 is about 90.0911011687.

The spelling of 731216 in words is "seven hundred thirty-one thousand, two hundred sixteen".