42640934 has 16 divisors (see below), whose sum is σ = 75457536. Its totient is φ = 17685000.

The previous prime is 42640931. The next prime is 42640937. The reversal of 42640934 is 43904624.

It is an interprime number because it is at equal distance from previous prime (42640931) and next prime (42640937).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42640934.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42640931) 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 7 ways as a sum of consecutive naturals, for example, 48692 + ... + 49559.

It is an arithmetic number, because the mean of its divisors is an integer number (4716096).

Almost surely, 2^42640934 is an apocalyptic number.

42640934 is a deficient number, since it is larger than the sum of its proper divisors (32816602).

42640934 is a wasteful number, since it uses less digits than its factorization.

42640934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98291.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 42640934 is about 6530.0026033685. The cubic root of 42640934 is about 349.3619231582.

The spelling of 42640934 in words is "forty-two million, six hundred forty thousand, nine hundred thirty-four".