40212405 has 12 divisors (see below), whose sum is σ = 69701580. Its totient is φ = 21446592.

The previous prime is 40212397. The next prime is 40212407. The reversal of 40212405 is 50421204.

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 23097636 = 4137^2 + 4806^2 .

It is not a de Polignac number, because 40212405 - 2³ = 40212397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40212407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 446760 + ... + 446849.

It is an arithmetic number, because the mean of its divisors is an integer number (5808465).

Almost surely, 2^40212405 is an apocalyptic number.

40212405 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40212405 is a deficient number, since it is larger than the sum of its proper divisors (29489175).

40212405 is a wasteful number, since it uses less digits than its factorization.

40212405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893620 (or 893617 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40212405 is about 6341.3251769642. The cubic root of 40212405 is about 342.5994667329.

Adding to 40212405 its reverse (50421204), we get a palindrome (90633609).

The spelling of 40212405 in words is "forty million, two hundred twelve thousand, four hundred five".