42118423 has 4 divisors (see below), whose sum is σ = 42144280. Its totient is φ = 42092568.

The previous prime is 42118409. The next prime is 42118463. The reversal of 42118423 is 32481124.

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 42118423 - 2²¹ = 40021271 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 (42118463) 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, 10308 + ... + 13801.

It is an arithmetic number, because the mean of its divisors is an integer number (10536070).

Almost surely, 2^42118423 is an apocalyptic number.

42118423 is a deficient number, since it is larger than the sum of its proper divisors (25857).

42118423 is a wasteful number, since it uses less digits than its factorization.

42118423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25856.

The product of its digits is 1536, while the sum is 25.

The square root of 42118423 is about 6489.8707999466. The cubic root of 42118423 is about 347.9290575210.

Adding to 42118423 its reverse (32481124), we get a palindrome (74599547).

It can be divided in two parts, 4211 and 8423, that multiplied together give a triangular number (35469253 = T₈₄₂₂).

The spelling of 42118423 in words is "forty-two million, one hundred eighteen thousand, four hundred twenty-three".