420723 has 6 divisors (see below), whose sum is σ = 607724. Its totient is φ = 280476.

The previous prime is 420691. The next prime is 420731. The reversal of 420723 is 327024.

It is a happy number.

It is not a de Polignac number, because 420723 - 2⁵ = 420691 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 420696 and 420705.

It is not an unprimeable number, because it can be changed into a prime (420743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23365 + ... + 23382.

2⁴²⁰⁷²³ is an apocalyptic number.

420723 is a deficient number, since it is larger than the sum of its proper divisors (187001).

420723 is a wasteful number, since it uses less digits than its factorization.

420723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46753 (or 46750 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 420723 is about 648.6316366012. The cubic root of 420723 is about 74.9316711011.

Adding to 420723 its reverse (327024), we get a palindrome (747747).

The spelling of 420723 in words is "four hundred twenty thousand, seven hundred twenty-three", and thus it is an iban number.