42505442 has 12 divisors (see below), whose sum is σ = 74167830. Its totient is φ = 18216576.

The previous prime is 42505427. The next prime is 42505447. The reversal of 42505442 is 24450524.

It can be written as a sum of positive squares in only one way, i.e., 41203561 + 1301881 = 6419^2 + 1141^2 .

It is not an unprimeable number, because it can be changed into a prime (42505447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216767 + ... + 216962.

Almost surely, 2^42505442 is an apocalyptic number.

42505442 is a deficient number, since it is larger than the sum of its proper divisors (31662388).

42505442 is a wasteful number, since it uses less digits than its factorization.

42505442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433745 (or 433738 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 42505442 is about 6519.6197741893. The cubic root of 42505442 is about 348.9914968522.

Adding to 42505442 its reverse (24450524), we get a palindrome (66955966).

The spelling of 42505442 in words is "forty-two million, five hundred five thousand, four hundred forty-two".