42638290 has 32 divisors (see below), whose sum is σ = 78427440. Its totient is φ = 16687104.

The previous prime is 42638279. The next prime is 42638291. The reversal of 42638290 is 9283624.

42638290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2099601 + 40538689 = 1449^2 + 6367^2 .

It is not an unprimeable number, because it can be changed into a prime (42638291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109416 + ... + 109804.

Almost surely, 2^42638290 is an apocalyptic number.

42638290 is a deficient number, since it is larger than the sum of its proper divisors (35789150).

42638290 is a wasteful number, since it uses less digits than its factorization.

42638290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 42638290 is about 6529.8001500812. The cubic root of 42638290 is about 349.3547021467.

The spelling of 42638290 in words is "forty-two million, six hundred thirty-eight thousand, two hundred ninety".