40689138 has 32 divisors (see below), whose sum is σ = 95276160. Its totient is φ = 11341440.

The previous prime is 40689133. The next prime is 40689157. The reversal of 40689138 is 83198604.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 40689096 and 40689105.

It is not an unprimeable number, because it can be changed into a prime (40689133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10093 + ... + 13536.

It is an arithmetic number, because the mean of its divisors is an integer number (2977380).

Almost surely, 2^40689138 is an apocalyptic number.

40689138 is an abundant number, since it is smaller than the sum of its proper divisors (54587022).

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

40689138 is a wasteful number, since it uses less digits than its factorization.

40689138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23682.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 40689138 is about 6378.8038063574. The cubic root of 40689138 is about 343.9480327574.

The spelling of 40689138 in words is "forty million, six hundred eighty-nine thousand, one hundred thirty-eight".