40640205 has 16 divisors (see below), whose sum is σ = 65634624. Its totient is φ = 21471360.

The previous prime is 40640177. The next prime is 40640219. The reversal of 40640205 is 50204604.

It is a happy number.

It is not a de Polignac number, because 40640205 - 2⁹ = 40639693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11056 + ... + 14265.

It is an arithmetic number, because the mean of its divisors is an integer number (4102164).

Almost surely, 2^40640205 is an apocalyptic number.

It is an amenable number.

40640205 is a deficient number, since it is larger than the sum of its proper divisors (24994419).

40640205 is a wasteful number, since it uses less digits than its factorization.

40640205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25436.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40640205 is about 6374.9670587384. The cubic root of 40640205 is about 343.8100994644.

Adding to 40640205 its reverse (50204604), we get a palindrome (90844809).

The spelling of 40640205 in words is "forty million, six hundred forty thousand, two hundred five".