123155405 has 8 divisors (see below), whose sum is σ = 152553984. Its totient is φ = 95346000.

The previous prime is 123155399. The next prime is 123155407. The reversal of 123155405 is 504551321.

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

It is not a de Polignac number, because 123155405 - 2¹² = 123151309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123155407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397121 + ... + 397430.

It is an arithmetic number, because the mean of its divisors is an integer number (19069248).

Almost surely, 2^123155405 is an apocalyptic number.

It is an amenable number.

123155405 is a deficient number, since it is larger than the sum of its proper divisors (29398579).

123155405 is an equidigital number, since it uses as much as digits as its factorization.

123155405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794587.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 123155405 is about 11097.5404932805. The cubic root of 123155405 is about 497.5283419457.

The spelling of 123155405 in words is "one hundred twenty-three million, one hundred fifty-five thousand, four hundred five".