42638378 has 8 divisors (see below), whose sum is σ = 64186020. Its totient is φ = 21243040.

The previous prime is 42638371. The next prime is 42638417. The reversal of 42638378 is 87383624.

It can be written as a sum of positive squares in 2 ways, for example, as 41434969 + 1203409 = 6437^2 + 1097^2 .

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

It is not an unprimeable number, because it can be changed into a prime (42638371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37373 + ... + 38496.

Almost surely, 2^42638378 is an apocalyptic number.

42638378 is a deficient number, since it is larger than the sum of its proper divisors (21547642).

42638378 is a wasteful number, since it uses less digits than its factorization.

42638378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76152.

The product of its digits is 193536, while the sum is 41.

The square root of 42638378 is about 6529.8068884156. The cubic root of 42638378 is about 349.3549424878.

The spelling of 42638378 in words is "forty-two million, six hundred thirty-eight thousand, three hundred seventy-eight".