42544042 has 4 divisors (see below), whose sum is σ = 63816066. Its totient is φ = 21272020.

The previous prime is 42544031. The next prime is 42544063. The reversal of 42544042 is 24044524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42107121 + 436921 = 6489^2 + 661^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42543998 and 42544016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636009 + ... + 10636012.

Almost surely, 2^42544042 is an apocalyptic number.

42544042 is a deficient number, since it is larger than the sum of its proper divisors (21272024).

42544042 is a wasteful number, since it uses less digits than its factorization.

42544042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21272023.

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 42544042 is about 6522.5793977536. The cubic root of 42544042 is about 349.0971068277.

Adding to 42544042 its reverse (24044524), we get a palindrome (66588566).

The spelling of 42544042 in words is "forty-two million, five hundred forty-four thousand, forty-two".