731365 has 4 divisors (see below), whose sum is σ = 877644. Its totient is φ = 585088.

The previous prime is 731363. The next prime is 731369. The reversal of 731365 is 563137.

It is a happy number.

731365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563137 = 601 ⋅937.

It can be written as a sum of positive squares in 2 ways, for example, as 113569 + 617796 = 337^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 731365 - 2¹ = 731363 is a prime.

It is a super-4 number, since 4×731365⁴ (a number of 25 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731363) 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, 73132 + ... + 73141.

It is an arithmetic number, because the mean of its divisors is an integer number (219411).

2⁷³¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

731365 is a deficient number, since it is larger than the sum of its proper divisors (146279).

731365 is a wasteful number, since it uses less digits than its factorization.

731365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146278.

The product of its digits is 1890, while the sum is 25.

The square root of 731365 is about 855.1988072957. The cubic root of 731365 is about 90.0972200458.

It can be divided in two parts, 731 and 365, that multiplied together give a triangular number (266815 = T₇₃₀).

The spelling of 731365 in words is "seven hundred thirty-one thousand, three hundred sixty-five".