423891 has 12 divisors (see below), whose sum is σ = 659568. Its totient is φ = 260784.

The previous prime is 423887. The next prime is 423931. The reversal of 423891 is 198324.

It is not a de Polignac number, because 423891 - 2² = 423887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1695 + ... + 1928.

It is an arithmetic number, because the mean of its divisors is an integer number (54964).

2⁴²³⁸⁹¹ is an apocalyptic number.

423891 is a deficient number, since it is larger than the sum of its proper divisors (235677).

423891 is a wasteful number, since it uses less digits than its factorization.

423891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642 (or 3639 counting only the distinct ones).

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

The square root of 423891 is about 651.0691207545. The cubic root of 423891 is about 75.1192768731.

The spelling of 423891 in words is "four hundred twenty-three thousand, eight hundred ninety-one".