123404445 has 48 divisors (see below), whose sum is σ = 233123520. Its totient is φ = 61924608.

The previous prime is 123404441. The next prime is 123404497. The reversal of 123404445 is 544404321.

It is a happy number.

It is not a de Polignac number, because 123404445 - 2² = 123404441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123404441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37434 + ... + 40596.

It is an arithmetic number, because the mean of its divisors is an integer number (4856740).

Almost surely, 2^123404445 is an apocalyptic number.

123404445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123404445 is a deficient number, since it is larger than the sum of its proper divisors (109719075).

123404445 is a wasteful number, since it uses less digits than its factorization.

123404445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211 (or 3188 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 123404445 is about 11108.7553308190. The cubic root of 123404445 is about 497.8634768747.

Adding to 123404445 its reverse (544404321), we get a palindrome (667808766).

The spelling of 123404445 in words is "one hundred twenty-three million, four hundred four thousand, four hundred forty-five".