423651 has 8 divisors (see below), whose sum is σ = 568000. Its totient is φ = 280872.

The previous prime is 423649. The next prime is 423667. The reversal of 423651 is 156324.

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 423651 - 2¹ = 423649 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 423651.

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, 600 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (71000).

2⁴²³⁶⁵¹ is an apocalyptic number.

423651 is a deficient number, since it is larger than the sum of its proper divisors (144349).

423651 is a wasteful number, since it uses less digits than its factorization.

423651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785.

The product of its digits is 720, while the sum is 21.

The square root of 423651 is about 650.8847824308. The cubic root of 423651 is about 75.1050971036.

Adding to 423651 its reverse (156324), we get a palindrome (579975).

The spelling of 423651 in words is "four hundred twenty-three thousand, six hundred fifty-one".