42640235 has 16 divisors (see below), whose sum is σ = 55991520. Its totient is φ = 30915840.

The previous prime is 42640231. The next prime is 42640271. The reversal of 42640235 is 53204624.

42640235 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42640235 - 2² = 42640231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42640231) 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 in 15 ways as a sum of consecutive naturals, for example, 20399 + ... + 22391.

It is an arithmetic number, because the mean of its divisors is an integer number (3499470).

Almost surely, 2^42640235 is an apocalyptic number.

42640235 is a deficient number, since it is larger than the sum of its proper divisors (13351285).

42640235 is a wasteful number, since it uses less digits than its factorization.

42640235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 42640235 is about 6529.9490809653. The cubic root of 42640235 is about 349.3600141528.

Adding to 42640235 its reverse (53204624), we get a palindrome (95844859).

It can be divided in two parts, 42640 and 235, that added together give a cube (42875 = 35³).

The spelling of 42640235 in words is "forty-two million, six hundred forty thousand, two hundred thirty-five".