423691 has 4 divisors (see below), whose sum is σ = 448632. Its totient is φ = 398752.

The previous prime is 423667. The next prime is 423697. The reversal of 423691 is 196324.

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

It is not a de Polignac number, because 423691 - 2⁹ = 423179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12445 + ... + 12478.

It is an arithmetic number, because the mean of its divisors is an integer number (112158).

2⁴²³⁶⁹¹ is an apocalyptic number.

423691 is a deficient number, since it is larger than the sum of its proper divisors (24941).

423691 is a wasteful number, since it uses less digits than its factorization.

423691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24940.

The product of its digits is 1296, while the sum is 25.

The square root of 423691 is about 650.9155091101. The cubic root of 423691 is about 75.1074607704.

The spelling of 423691 in words is "four hundred twenty-three thousand, six hundred ninety-one".