123505455 has 16 divisors (see below), whose sum is σ = 200559744. Its totient is φ = 64885920.

The previous prime is 123505451. The next prime is 123505471. The reversal of 123505455 is 554505321.

It is a happy number.

It is not a de Polignac number, because 123505455 - 2² = 123505451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123505451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60441 + ... + 62450.

It is an arithmetic number, because the mean of its divisors is an integer number (12534984).

Almost surely, 2^123505455 is an apocalyptic number.

123505455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123505455 is a deficient number, since it is larger than the sum of its proper divisors (77054289).

123505455 is a wasteful number, since it uses less digits than its factorization.

123505455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122966.

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 123505455 is about 11113.3008147895. The cubic root of 123505455 is about 497.9992782364. Note that the first 3 decimals are identical.

The spelling of 123505455 in words is "one hundred twenty-three million, five hundred five thousand, four hundred fifty-five".