423138 has 16 divisors (see below), whose sum is σ = 855360. Its totient is φ = 139536.

The previous prime is 423133. The next prime is 423173. The reversal of 423138 is 831324.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423133) 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, 331 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (53460).

2⁴²³¹³⁸ is an apocalyptic number.

423138 is an abundant number, since it is smaller than the sum of its proper divisors (432222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423138 is a wasteful number, since it uses less digits than its factorization.

423138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761.

The product of its digits is 576, while the sum is 21.

The square root of 423138 is about 650.4905840979. The cubic root of 423138 is about 75.0747698792.

It can be divided in two parts, 423 and 138, that added together give a triangular number (561 = T₃₃).

The spelling of 423138 in words is "four hundred twenty-three thousand, one hundred thirty-eight".