42640747 has 2 divisors, whose sum is σ = 42640748. Its totient is φ = 42640746.

The previous prime is 42640733. The next prime is 42640753. The reversal of 42640747 is 74704624.

42640747 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42640747 is a prime.

It is equal to p_2584159 and since 42640747 and 2584159 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42640757) 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, 21320373 + 21320374.

It is an arithmetic number, because the mean of its divisors is an integer number (21320374).

Almost surely, 2^42640747 is an apocalyptic number.

42640747 is a deficient number, since it is larger than the sum of its proper divisors (1).

42640747 is an equidigital number, since it uses as much as digits as its factorization.

42640747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 42640747 is about 6529.9882848287. The cubic root of 42640747 is about 349.3614124535.

The spelling of 42640747 in words is "forty-two million, six hundred forty thousand, seven hundred forty-seven".