40405361 has 4 divisors (see below), whose sum is σ = 40639092. Its totient is φ = 40171632.

The previous prime is 40405357. The next prime is 40405397. The reversal of 40405361 is 16350404.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15555136 + 24850225 = 3944^2 + 4985^2 .

It is a cyclic number.

It is not a de Polignac number, because 40405361 - 2² = 40405357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40405331) 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 3 ways as a sum of consecutive naturals, for example, 116606 + ... + 116951.

It is an arithmetic number, because the mean of its divisors is an integer number (10159773).

Almost surely, 2^40405361 is an apocalyptic number.

It is an amenable number.

40405361 is a deficient number, since it is larger than the sum of its proper divisors (233731).

40405361 is a wasteful number, since it uses less digits than its factorization.

40405361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233730.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 40405361 is about 6356.5211397430. The cubic root of 40405361 is about 343.1465712719.

Adding to 40405361 its reverse (16350404), we get a palindrome (56755765).

The spelling of 40405361 in words is "forty million, four hundred five thousand, three hundred sixty-one".