42120423 has 12 divisors (see below), whose sum is σ = 60953568. Its totient is φ = 28028160.

The previous prime is 42120409. The next prime is 42120427. The reversal of 42120423 is 32402124.

42120423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42120423 - 2⁵ = 42120391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42120396 and 42120405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42120427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1138 + ... + 9248.

It is an arithmetic number, because the mean of its divisors is an integer number (5079464).

Almost surely, 2^42120423 is an apocalyptic number.

42120423 is a deficient number, since it is larger than the sum of its proper divisors (18833145).

42120423 is a wasteful number, since it uses less digits than its factorization.

42120423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8694 (or 8691 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 42120423 is about 6490.0248843899. The cubic root of 42120423 is about 347.9345645894.

Adding to 42120423 its reverse (32402124), we get a palindrome (74522547).

The spelling of 42120423 in words is "forty-two million, one hundred twenty thousand, four hundred twenty-three".