423681 has 8 divisors (see below), whose sum is σ = 594720. Its totient is φ = 267552.

The previous prime is 423667. The next prime is 423697. The reversal of 423681 is 186324.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 423681 - 2⁵ = 423649 is a prime.

It is a super-2 number, since 2×423681² = 359011179522, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 423681.

It is not an unprimeable number, because it can be changed into a prime (423601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3660 + ... + 3773.

It is an arithmetic number, because the mean of its divisors is an integer number (74340).

2⁴²³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

423681 is a deficient number, since it is larger than the sum of its proper divisors (171039).

423681 is a wasteful number, since it uses less digits than its factorization.

423681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7455.

The product of its digits is 1152, while the sum is 24.

The square root of 423681 is about 650.9078275762. The cubic root of 423681 is about 75.1068698676.

The spelling of 423681 in words is "four hundred twenty-three thousand, six hundred eighty-one".