123445456 has 20 divisors (see below), whose sum is σ = 243098404. Its totient is φ = 60710400.

The previous prime is 123445447. The next prime is 123445477. The reversal of 123445456 is 654544321.

It can be written as a sum of positive squares in 2 ways, for example, as 11424400 + 112021056 = 3380^2 + 10584^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 62265 + ... + 64216.

Almost surely, 2^123445456 is an apocalyptic number.

123445456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

123445456 is a deficient number, since it is larger than the sum of its proper divisors (119652948).

123445456 is a wasteful number, since it uses less digits than its factorization.

123445456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126550 (or 126544 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

The square root of 123445456 is about 11110.6010638489. The cubic root of 123445456 is about 497.9186224238.

Adding to 123445456 its reverse (654544321), we get a palindrome (777989777).

The spelling of 123445456 in words is "one hundred twenty-three million, four hundred forty-five thousand, four hundred fifty-six".