123155434 has 4 divisors (see below), whose sum is σ = 184733154. Its totient is φ = 61577716.

The previous prime is 123155419. The next prime is 123155437. The reversal of 123155434 is 434551321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434551321 = 227 ⋅1914323.

It can be written as a sum of positive squares in only one way, i.e., 101949409 + 21206025 = 10097^2 + 4605^2 .

It is not an unprimeable number, because it can be changed into a prime (123155437) 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 as a sum of consecutive naturals, namely, 30788857 + ... + 30788860.

Almost surely, 2^123155434 is an apocalyptic number.

123155434 is a deficient number, since it is larger than the sum of its proper divisors (61577720).

123155434 is an equidigital number, since it uses as much as digits as its factorization.

123155434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61577719.

The product of its digits is 7200, while the sum is 28.

The square root of 123155434 is about 11097.5417998762. The cubic root of 123155434 is about 497.5283809975.

It can be divided in two parts, 1231 and 55434, that added together give a palindrome (56665).

The spelling of 123155434 in words is "one hundred twenty-three million, one hundred fifty-five thousand, four hundred thirty-four".