123654 has 16 divisors (see below), whose sum is σ = 254448. Its totient is φ = 40032.

The previous prime is 123653. The next prime is 123661. The reversal of 123654 is 456321.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 123654.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 123654.

It is not an unprimeable number, because it can be changed into a prime (123653) 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, 57 + ... + 500.

It is an arithmetic number, because the mean of its divisors is an integer number (15903).

2¹²³⁶⁵⁴ is an apocalyptic number.

123654 is an abundant number, since it is smaller than the sum of its proper divisors (130794).

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

123654 is a wasteful number, since it uses less digits than its factorization.

123654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599.

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

The square root of 123654 is about 351.6447070553. The cubic root of 123654 is about 49.8198852862.

Adding to 123654 its reverse (456321), we get a palindrome (579975).

It can be divided in two parts, 123 and 654, that added together give a palindrome (777).

The spelling of 123654 in words is "one hundred twenty-three thousand, six hundred fifty-four".