123440455 has 4 divisors (see below), whose sum is σ = 148128552. Its totient is φ = 98752360.

The previous prime is 123440437. The next prime is 123440459. The reversal of 123440455 is 554044321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123440455 - 2¹¹ = 123438407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123440459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12344041 + ... + 12344050.

It is an arithmetic number, because the mean of its divisors is an integer number (37032138).

Almost surely, 2^123440455 is an apocalyptic number.

123440455 is a deficient number, since it is larger than the sum of its proper divisors (24688097).

123440455 is an equidigital number, since it uses as much as digits as its factorization.

123440455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24688096.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 123440455 is about 11110.3760062385. The cubic root of 123440455 is about 497.9118984700.

Adding to 123440455 its reverse (554044321), we get a palindrome (677484776).

The spelling of 123440455 in words is "one hundred twenty-three million, four hundred forty thousand, four hundred fifty-five".