423511 has 4 divisors (see below), whose sum is σ = 462024. Its totient is φ = 385000.

The previous prime is 423509. The next prime is 423541. The reversal of 423511 is 115324.

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

It is not a de Polignac number, because 423511 - 2¹ = 423509 is a prime.

It is a Duffinian number.

423511 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423541) 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, 19240 + ... + 19261.

It is an arithmetic number, because the mean of its divisors is an integer number (115506).

2⁴²³⁵¹¹ is an apocalyptic number.

423511 is a deficient number, since it is larger than the sum of its proper divisors (38513).

423511 is a wasteful number, since it uses less digits than its factorization.

423511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38512.

The product of its digits is 120, while the sum is 16.

The square root of 423511 is about 650.7772276286. Note that the first 3 decimals coincide. The cubic root of 423511 is about 75.0968230982.

Adding to 423511 its reverse (115324), we get a palindrome (538835).

It can be divided in two parts, 423 and 511, that multiplied together give a triangular number (216153 = T₆₅₇).

The spelling of 423511 in words is "four hundred twenty-three thousand, five hundred eleven".