731023 has 4 divisors (see below), whose sum is σ = 733248. Its totient is φ = 728800.

The previous prime is 730999. The next prime is 731033. The reversal of 731023 is 320137.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731023 is a prime.

It is a Duffinian number.

731023 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 730988 and 731006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731033) 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, 511 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (183312).

2⁷³¹⁰²³ is an apocalyptic number.

731023 is a deficient number, since it is larger than the sum of its proper divisors (2225).

731023 is a wasteful number, since it uses less digits than its factorization.

731023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224.

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 731023 is about 854.9988304086. The cubic root of 731023 is about 90.0831741392.

The spelling of 731023 in words is "seven hundred thirty-one thousand, twenty-three".