42405442 has 8 divisors (see below), whose sum is σ = 63636156. Its totient is φ = 21193392.

The previous prime is 42405437. The next prime is 42405443. The reversal of 42405442 is 24450424.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42393121 + 12321 = 6511^2 + 111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×42405442² = 3596443022430728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42405443) 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, 5128 + ... + 10540.

Almost surely, 2^42405442 is an apocalyptic number.

42405442 is a deficient number, since it is larger than the sum of its proper divisors (21230714).

42405442 is a wasteful number, since it uses less digits than its factorization.

42405442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9332.

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

The square root of 42405442 is about 6511.9460992855. The cubic root of 42405442 is about 348.7175981682.

Adding to 42405442 its reverse (24450424), we get a palindrome (66855866).

The spelling of 42405442 in words is "forty-two million, four hundred five thousand, four hundred forty-two".