40281605 has 32 divisors (see below), whose sum is σ = 59910144. Its totient is φ = 25318656.

The previous prime is 40281599. The next prime is 40281607. The reversal of 40281605 is 50618204.

It is a cyclic number.

It is not a de Polignac number, because 40281605 - 2⁴ = 40281589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40281607) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 101267 + ... + 101663.

It is an arithmetic number, because the mean of its divisors is an integer number (1872192).

Almost surely, 2^40281605 is an apocalyptic number.

It is an amenable number.

40281605 is a deficient number, since it is larger than the sum of its proper divisors (19628539).

40281605 is a wasteful number, since it uses less digits than its factorization.

40281605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 40281605 is about 6346.7791043962. The cubic root of 40281605 is about 342.7958762468.

Adding to 40281605 its reverse (50618204), we get a palindrome (90899809).

The spelling of 40281605 in words is "forty million, two hundred eighty-one thousand, six hundred five".