42638377 has 4 divisors (see below), whose sum is σ = 42760900. Its totient is φ = 42515856.

The previous prime is 42638371. The next prime is 42638417. The reversal of 42638377 is 77383624.

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 2 ways, for example, as 36433296 + 6205081 = 6036^2 + 2491^2 .

It is a cyclic number.

It is not a de Polignac number, because 42638377 - 2³ = 42638369 is a prime.

It is a Duffinian number.

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, 60738 + ... + 61435.

It is an arithmetic number, because the mean of its divisors is an integer number (10690225).

Almost surely, 2^42638377 is an apocalyptic number.

It is an amenable number.

42638377 is a deficient number, since it is larger than the sum of its proper divisors (122523).

42638377 is a wasteful number, since it uses less digits than its factorization.

42638377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122522.

The product of its digits is 169344, while the sum is 40.

The square root of 42638377 is about 6529.8068118437. The cubic root of 42638377 is about 349.3549397566.

The spelling of 42638377 in words is "forty-two million, six hundred thirty-eight thousand, three hundred seventy-seven".