405723 has 4 divisors (see below), whose sum is σ = 540968. Its totient is φ = 270480.
The previous prime is 405719. The next prime is 405731. The reversal of 405723 is 327504.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 405723 - 22 = 405719 is a prime.
It is a super-2 number, since 2×4057232 = 329222305458, which contains 22 as substring.
It is an Ulam number.
It is a D-number.
It is a Duffinian number.
405723 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 405723.
It is not an unprimeable number, because it can be changed into a prime (405703) 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, 67618 + ... + 67623.
It is an arithmetic number, because the mean of its divisors is an integer number (135242).
2405723 is an apocalyptic number.
405723 is a deficient number, since it is larger than the sum of its proper divisors (135245).
405723 is a wasteful number, since it uses less digits than its factorization.
405723 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 135244.
The product of its (nonzero) digits is 840, while the sum is 21.
The square root of 405723 is about 636.9638922262. The cubic root of 405723 is about 74.0303625100.
It can be divided in two parts, 405 and 723, that added together give a triangular number (1128 = T47).
The spelling of 405723 in words is "four hundred five thousand, seven hundred twenty-three".
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