40209885 has 32 divisors (see below), whose sum is σ = 72000000. Its totient is φ = 21290688.

The previous prime is 40209853. The next prime is 40209887. The reversal of 40209885 is 58890204.

It is not a de Polignac number, because 40209885 - 2⁵ = 40209853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40209887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19116 + ... + 21114.

It is an arithmetic number, because the mean of its divisors is an integer number (2250000).

Almost surely, 2^40209885 is an apocalyptic number.

40209885 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40209885 is a deficient number, since it is larger than the sum of its proper divisors (31790115).

40209885 is a wasteful number, since it uses less digits than its factorization.

40209885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162 (or 2156 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 40209885 is about 6341.1264772121. The cubic root of 40209885 is about 342.5923099970.

The spelling of 40209885 in words is "forty million, two hundred nine thousand, eight hundred eighty-five".