40556405 has 4 divisors (see below), whose sum is σ = 48667692. Its totient is φ = 32445120.

The previous prime is 40556381. The next prime is 40556419. The reversal of 40556405 is 50465504.

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 30052324 + 10504081 = 5482^2 + 3241^2 .

It is a de Polignac number, because none of the positive numbers 2^k-40556405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4055636 + ... + 4055645.

It is an arithmetic number, because the mean of its divisors is an integer number (12166923).

Almost surely, 2^40556405 is an apocalyptic number.

It is an amenable number.

40556405 is a deficient number, since it is larger than the sum of its proper divisors (8111287).

40556405 is an equidigital number, since it uses as much as digits as its factorization.

40556405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8111286.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 40556405 is about 6368.3910840965. The cubic root of 40556405 is about 343.5736250012.

Subtracting 40556405 from its reverse (50465504), we obtain a palindrome (9909099).

The spelling of 40556405 in words is "forty million, five hundred fifty-six thousand, four hundred five".