123438 has 16 divisors (see below), whose sum is σ = 282240. Its totient is φ = 35256.

The previous prime is 123433. The next prime is 123439. The reversal of 123438 is 834321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123433) 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, 1428 + ... + 1511.

It is an arithmetic number, because the mean of its divisors is an integer number (17640).

2¹²³⁴³⁸ is an apocalyptic number.

123438 is an abundant number, since it is smaller than the sum of its proper divisors (158802).

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

123438 is a wasteful number, since it uses less digits than its factorization.

123438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951.

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

The square root of 123438 is about 351.3374446312. The cubic root of 123438 is about 49.7908597602.

Adding to 123438 its reverse (834321), we get a palindrome (957759).

It can be divided in two parts, 123 and 438, that added together give a triangular number (561 = T₃₃).

The spelling of 123438 in words is "one hundred twenty-three thousand, four hundred thirty-eight".