123421554 has 24 divisors (see below), whose sum is σ = 267883200. Its totient is φ = 41068248.

The previous prime is 123421553. The next prime is 123421559. The reversal of 123421554 is 455124321.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123421553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5059 + ... + 16505.

It is an arithmetic number, because the mean of its divisors is an integer number (11161800).

Almost surely, 2^123421554 is an apocalyptic number.

123421554 is an abundant number, since it is smaller than the sum of its proper divisors (144461646).

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

123421554 is a wasteful number, since it uses less digits than its factorization.

123421554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12054 (or 12051 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 123421554 is about 11109.5253724000. The cubic root of 123421554 is about 497.8864840217.

Adding to 123421554 its reverse (455124321), we get a palindrome (578545875).

The spelling of 123421554 in words is "one hundred twenty-three million, four hundred twenty-one thousand, five hundred fifty-four".