42120042 has 16 divisors (see below), whose sum is σ = 84464640. Its totient is φ = 14002592.

The previous prime is 42120007. The next prime is 42120049. The reversal of 42120042 is 24002124.

It is not an unprimeable number, because it can be changed into a prime (42120049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6867 + ... + 11462.

It is an arithmetic number, because the mean of its divisors is an integer number (5279040).

Almost surely, 2^42120042 is an apocalyptic number.

42120042 is an abundant number, since it is smaller than the sum of its proper divisors (42344598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42120042 is a wasteful number, since it uses less digits than its factorization.

42120042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18717.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 42120042 is about 6489.9955315855. The cubic root of 42120042 is about 347.9335155063.

Adding to 42120042 its reverse (24002124), we get a palindrome (66122166).

The spelling of 42120042 in words is "forty-two million, one hundred twenty thousand, forty-two".