123043155 has 32 divisors (see below), whose sum is σ = 201166848. Its totient is φ = 64204800.

The previous prime is 123043147. The next prime is 123043159. The reversal of 123043155 is 551340321.

It is not a de Polignac number, because 123043155 - 2³ = 123043147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123043159) 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 31 ways as a sum of consecutive naturals, for example, 191635 + ... + 192275.

It is an arithmetic number, because the mean of its divisors is an integer number (6286464).

Almost surely, 2^123043155 is an apocalyptic number.

123043155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123043155 is a deficient number, since it is larger than the sum of its proper divisors (78123693).

123043155 is a wasteful number, since it uses less digits than its factorization.

123043155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 123043155 is about 11092.4819134403. The cubic root of 123043155 is about 497.3771385876.

Adding to 123043155 its reverse (551340321), we get a palindrome (674383476).

The spelling of 123043155 in words is "one hundred twenty-three million, forty-three thousand, one hundred fifty-five".