40021205 has 16 divisors (see below), whose sum is σ = 56056320. Its totient is φ = 26858112.

The previous prime is 40021199. The next prime is 40021211. The reversal of 40021205 is 50212004.

40021205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40021199) and next prime (40021211).

It is a cyclic number.

It is not a de Polignac number, because 40021205 - 2⁸ = 40020949 is a prime.

It is a super-3 number, since 3×40021205³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40021205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10520 + ... + 13809.

It is an arithmetic number, because the mean of its divisors is an integer number (3503520).

Almost surely, 2^40021205 is an apocalyptic number.

It is an amenable number.

40021205 is a deficient number, since it is larger than the sum of its proper divisors (16035115).

40021205 is a wasteful number, since it uses less digits than its factorization.

40021205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24388.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40021205 is about 6326.2315006645. The cubic root of 40021205 is about 342.0556120593.

Adding to 40021205 its reverse (50212004), we get a palindrome (90233209).

The spelling of 40021205 in words is "forty million, twenty-one thousand, two hundred five".