40209605 has 8 divisors (see below), whose sum is σ = 50791200. Its totient is φ = 30474576.

The previous prime is 40209571. The next prime is 40209629. The reversal of 40209605 is 50690204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40209605 - 2⁶ = 40209541 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211535 + ... + 211724.

It is an arithmetic number, because the mean of its divisors is an integer number (6348900).

Almost surely, 2^40209605 is an apocalyptic number.

It is an amenable number.

40209605 is a deficient number, since it is larger than the sum of its proper divisors (10581595).

40209605 is a wasteful number, since it uses less digits than its factorization.

40209605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423283.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40209605 is about 6341.1043990775. The cubic root of 40209605 is about 342.5915147856.

Adding to 40209605 its reverse (50690204), we get a palindrome (90899809).

The spelling of 40209605 in words is "forty million, two hundred nine thousand, six hundred five".