40685128 has 16 divisors (see below), whose sum is σ = 83219760. Its totient is φ = 18493200.

The previous prime is 40685083. The next prime is 40685129. The reversal of 40685128 is 82158604.

It is a junction number, because it is equal to n+sod(n) for n = 40685093 and 40685102.

It is not an unprimeable number, because it can be changed into a prime (40685129) 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, 231078 + ... + 231253.

It is an arithmetic number, because the mean of its divisors is an integer number (5201235).

Almost surely, 2^40685128 is an apocalyptic number.

It is an amenable number.

40685128 is an abundant number, since it is smaller than the sum of its proper divisors (42534632).

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

40685128 is a wasteful number, since it uses less digits than its factorization.

40685128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462348 (or 462344 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 40685128 is about 6378.4894763572. The cubic root of 40685128 is about 343.9367334525.

The spelling of 40685128 in words is "forty million, six hundred eighty-five thousand, one hundred twenty-eight".