40635909 has 6 divisors (see below), whose sum is σ = 58696326. Its totient is φ = 27090600.

The previous prime is 40635901. The next prime is 40635911. The reversal of 40635909 is 90953604.

40635909 is a `hidden beast` number, since 4 + 0 + 63 + 590 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40068900 + 567009 = 6330^2 + 753^2 .

It is not a de Polignac number, because 40635909 - 2³ = 40635901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40635901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257542 + ... + 2257559.

It is an arithmetic number, because the mean of its divisors is an integer number (9782721).

Almost surely, 2^40635909 is an apocalyptic number.

It is an amenable number.

40635909 is a deficient number, since it is larger than the sum of its proper divisors (18060417).

40635909 is a wasteful number, since it uses less digits than its factorization.

40635909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515107 (or 4515104 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 40635909 is about 6374.6301069160. The cubic root of 40635909 is about 343.7979845301.

It can be divided in two parts, 406 and 35909, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 40635909 in words is "forty million, six hundred thirty-five thousand, nine hundred nine".