123042405 has 16 divisors (see below), whose sum is σ = 198373824. Its totient is φ = 65120640.

The previous prime is 123042397. The next prime is 123042443. The reversal of 123042405 is 504240321.

It is not a de Polignac number, because 123042405 - 2³ = 123042397 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, 29344 + ... + 33273.

It is an arithmetic number, because the mean of its divisors is an integer number (12398364).

Almost surely, 2^123042405 is an apocalyptic number.

123042405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123042405 is a deficient number, since it is larger than the sum of its proper divisors (75331419).

123042405 is a wasteful number, since it uses less digits than its factorization.

123042405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62756.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 123042405 is about 11092.4481067076. The cubic root of 123042405 is about 497.3761280110.

Adding to 123042405 its reverse (504240321), we get a palindrome (627282726).

The spelling of 123042405 in words is "one hundred twenty-three million, forty-two thousand, four hundred five".