42638741 has 2 divisors, whose sum is σ = 42638742. Its totient is φ = 42638740.

The previous prime is 42638723. The next prime is 42638747. The reversal of 42638741 is 14783624.

42638741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22800625 + 19838116 = 4775^2 + 4454^2 .

It is a cyclic number.

It is not a de Polignac number, because 42638741 - 2²² = 38444437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42638747) 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 as a sum of consecutive naturals, namely, 21319370 + 21319371.

It is an arithmetic number, because the mean of its divisors is an integer number (21319371).

Almost surely, 2^42638741 is an apocalyptic number.

It is an amenable number.

42638741 is a deficient number, since it is larger than the sum of its proper divisors (1).

42638741 is an equidigital number, since it uses as much as digits as its factorization.

42638741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 42638741 is about 6529.8346839717. The cubic root of 42638741 is about 349.3559338911.

The spelling of 42638741 in words is "forty-two million, six hundred thirty-eight thousand, seven hundred forty-one".