123973555 has 4 divisors (see below), whose sum is σ = 148768272. Its totient is φ = 99178840.

The previous prime is 123973523. The next prime is 123973559. The reversal of 123973555 is 555379321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123973555 - 2⁵ = 123973523 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123973559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12397351 + ... + 12397360.

It is an arithmetic number, because the mean of its divisors is an integer number (37192068).

Almost surely, 2^123973555 is an apocalyptic number.

123973555 is a deficient number, since it is larger than the sum of its proper divisors (24794717).

123973555 is an equidigital number, since it uses as much as digits as its factorization.

123973555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24794716.

The product of its digits is 141750, while the sum is 40.

The square root of 123973555 is about 11134.3412467914. The cubic root of 123973555 is about 498.6276433875.

The spelling of 123973555 in words is "one hundred twenty-three million, nine hundred seventy-three thousand, five hundred fifty-five".