123240223405 has 16 divisors (see below), whose sum is σ = 159332750640. Its totient is φ = 90969043968.

The previous prime is 123240223397. The next prime is 123240223417. The reversal of 123240223405 is 504322042321.

It can be written as a sum of positive squares in 8 ways, for example, as 670913604 + 122569309801 = 25902^2 + 350099^2 .

It is a cyclic number.

It is not a de Polignac number, because 123240223405 - 2³ = 123240223397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254700 + ... + 557989.

It is an arithmetic number, because the mean of its divisors is an integer number (9958296915).

Almost surely, 2^123240223405 is an apocalyptic number.

It is an amenable number.

123240223405 is a deficient number, since it is larger than the sum of its proper divisors (36092527235).

123240223405 is a wasteful number, since it uses less digits than its factorization.

123240223405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815040.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 123240223405 its reverse (504322042321), we get a palindrome (627562265726).

The spelling of 123240223405 in words is "one hundred twenty-three billion, two hundred forty million, two hundred twenty-three thousand, four hundred five".