423819 has 16 divisors (see below), whose sum is σ = 685440. Its totient is φ = 256680.

The previous prime is 423803. The next prime is 423823. The reversal of 423819 is 918324.

It is not a de Polignac number, because 423819 - 2⁴ = 423803 is a prime.

It is a super-2 number, since 2×423819² = 359245089522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 423792 and 423801.

It is not an unprimeable number, because it can be changed into a prime (423859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417 + ... + 1010.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2⁴²³⁸¹⁹ is an apocalyptic number.

423819 is a deficient number, since it is larger than the sum of its proper divisors (261621).

423819 is a wasteful number, since it uses less digits than its factorization.

423819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447 (or 1441 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 423819 is about 651.0138247380. The cubic root of 423819 is about 75.1150235044.

The spelling of 423819 in words is "four hundred twenty-three thousand, eight hundred nineteen".