42123503 has 4 divisors (see below), whose sum is σ = 42752280. Its totient is φ = 41494728.

The previous prime is 42123493. The next prime is 42123509. The reversal of 42123503 is 30532124.

It is a happy number.

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 42123503 - 2²⁰ = 41074927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123509) 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, 314288 + ... + 314421.

It is an arithmetic number, because the mean of its divisors is an integer number (10688070).

Almost surely, 2^42123503 is an apocalyptic number.

42123503 is a deficient number, since it is larger than the sum of its proper divisors (628777).

42123503 is an equidigital number, since it uses as much as digits as its factorization.

42123503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628776.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 42123503 is about 6490.2621672780. The cubic root of 42123503 is about 347.9430451337.

Adding to 42123503 its reverse (30532124), we get a palindrome (72655627).

The spelling of 42123503 in words is "forty-two million, one hundred twenty-three thousand, five hundred three".