40206905 has 16 divisors (see below), whose sum is σ = 50274000. Its totient is φ = 30831360.

The previous prime is 40206889. The next prime is 40206911. The reversal of 40206905 is 50960204.

It can be written as a sum of positive squares in 8 ways, for example, as 14845609 + 25361296 = 3853^2 + 5036^2 .

It is not a de Polignac number, because 40206905 - 2⁴ = 40206889 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20675 + ... + 22535.

It is an arithmetic number, because the mean of its divisors is an integer number (3142125).

Almost surely, 2^40206905 is an apocalyptic number.

It is an amenable number.

40206905 is a deficient number, since it is larger than the sum of its proper divisors (10067095).

40206905 is a wasteful number, since it uses less digits than its factorization.

40206905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2044.

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

The square root of 40206905 is about 6340.8914988352. The cubic root of 40206905 is about 342.5838464869.

The spelling of 40206905 in words is "forty million, two hundred six thousand, nine hundred five".