123389723503 has 4 divisors (see below), whose sum is σ = 123585270448. Its totient is φ = 123194176560.

The previous prime is 123389723489. The next prime is 123389723507. The reversal of 123389723503 is 305327983321.

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 123389723503 - 2⁹ = 123389722991 is a prime.

It is a super-2 number, since 2×123389723503² (a number of 23 digits) 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 (123389723507) 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, 97772526 + ... + 97773787.

It is an arithmetic number, because the mean of its divisors is an integer number (30896317612).

Almost surely, 2^123389723503 is an apocalyptic number.

123389723503 is a deficient number, since it is larger than the sum of its proper divisors (195546945).

123389723503 is an equidigital number, since it uses as much as digits as its factorization.

123389723503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195546944.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 123389723503 in words is "one hundred twenty-three billion, three hundred eighty-nine million, seven hundred twenty-three thousand, five hundred three".