40405145 has 16 divisors (see below), whose sum is σ = 53110080. Its totient is φ = 29265600.

The previous prime is 40405139. The next prime is 40405163. The reversal of 40405145 is 54150404.

It is not a de Polignac number, because 40405145 - 2²² = 36210841 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 40405145.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13430 + ... + 16160.

It is an arithmetic number, because the mean of its divisors is an integer number (3319380).

Almost surely, 2^40405145 is an apocalyptic number.

It is an amenable number.

40405145 is a deficient number, since it is larger than the sum of its proper divisors (12704935).

40405145 is a wasteful number, since it uses less digits than its factorization.

40405145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 40405145 is about 6356.5041492946. The cubic root of 40405145 is about 343.1459598036.

Adding to 40405145 its reverse (54150404), we get a palindrome (94555549).

The spelling of 40405145 in words is "forty million, four hundred five thousand, one hundred forty-five".