40542405 has 16 divisors (see below), whose sum is σ = 65690880. Its totient is φ = 21348288.

The previous prime is 40542401. The next prime is 40542419. The reversal of 40542405 is 50424504.

It is not a de Polignac number, because 40542405 - 2² = 40542401 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 (40542401) 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 15 ways as a sum of consecutive naturals, for example, 15922 + ... + 18291.

It is an arithmetic number, because the mean of its divisors is an integer number (4105680).

Almost surely, 2^40542405 is an apocalyptic number.

It is an amenable number.

40542405 is a deficient number, since it is larger than the sum of its proper divisors (25148475).

40542405 is a wasteful number, since it uses less digits than its factorization.

40542405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34300.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 40542405 is about 6367.2918104953. The cubic root of 40542405 is about 343.5340867800.

Adding to 40542405 its reverse (50424504), we get a palindrome (90966909).

The spelling of 40542405 in words is "forty million, five hundred forty-two thousand, four hundred five".