405603123 has 8 divisors (see below), whose sum is σ = 542651088. Its totient is φ = 269478624.

The previous prime is 405603113. The next prime is 405603131. The reversal of 405603123 is 321306504.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 405603123 - 2¹⁴ = 405586739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405603093 and 405603102.

It is not an unprimeable number, because it can be changed into a prime (405603113) 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, 229840 + ... + 231597.

It is an arithmetic number, because the mean of its divisors is an integer number (67831386).

Almost surely, 2^405603123 is an apocalyptic number.

405603123 is a deficient number, since it is larger than the sum of its proper divisors (137047965).

405603123 is a wasteful number, since it uses less digits than its factorization.

405603123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461733.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 405603123 is about 20139.5909342767. The cubic root of 405603123 is about 740.2307066149.

Adding to 405603123 its reverse (321306504), we get a palindrome (726909627).

The spelling of 405603123 in words is "four hundred five million, six hundred three thousand, one hundred twenty-three".