42640936 has 16 divisors (see below), whose sum is σ = 86102100. Its totient is φ = 19680384.

The previous prime is 42640931. The next prime is 42640937. The reversal of 42640936 is 63904624.

It can be written as a sum of positive squares in 2 ways, for example, as 42640900 + 36 = 6530^2 + 6^2 .

It is not an unprimeable number, because it can be changed into a prime (42640931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204901 + ... + 205108.

Almost surely, 2^42640936 is an apocalyptic number.

It is an amenable number.

42640936 is an abundant number, since it is smaller than the sum of its proper divisors (43461164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42640936 is a wasteful number, since it uses less digits than its factorization.

42640936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410028 (or 410024 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 42640936 is about 6530.0027565078. The cubic root of 42640936 is about 349.3619286202.

It can be divided in two parts, 426409 and 36, that multiplied together give a square (15350724 = 3918²).

The spelling of 42640936 in words is "forty-two million, six hundred forty thousand, nine hundred thirty-six".