123978623 has 4 divisors (see below), whose sum is σ = 124001208. Its totient is φ = 123956040.

The previous prime is 123978587. The next prime is 123978643. The reversal of 123978623 is 326879321.

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

It is a cyclic number.

It is not a de Polignac number, because 123978623 - 2⁶ = 123978559 is a prime.

It is a super-2 number, since 2×123978623² = 30741397921952258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123978643) 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, 2828 + ... + 15998.

It is an arithmetic number, because the mean of its divisors is an integer number (31000302).

Almost surely, 2^123978623 is an apocalyptic number.

123978623 is a deficient number, since it is larger than the sum of its proper divisors (22585).

123978623 is an equidigital number, since it uses as much as digits as its factorization.

123978623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22584.

The product of its digits is 108864, while the sum is 41.

The square root of 123978623 is about 11134.5688286525. The cubic root of 123978623 is about 498.6344378754.

The spelling of 123978623 in words is "one hundred twenty-three million, nine hundred seventy-eight thousand, six hundred twenty-three".