40409305 has 8 divisors (see below), whose sum is σ = 48529800. Its totient is φ = 32301696.

The previous prime is 40409279. The next prime is 40409309. The reversal of 40409305 is 50390404.

It can be written as a sum of positive squares in 4 ways, for example, as 1121481 + 39287824 = 1059^2 + 6268^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40409305 - 2⁵ = 40409273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40409305.

It is not an unprimeable number, because it can be changed into a prime (40409309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6181 + ... + 10909.

It is an arithmetic number, because the mean of its divisors is an integer number (6066225).

Almost surely, 2^40409305 is an apocalyptic number.

It is an amenable number.

40409305 is a deficient number, since it is larger than the sum of its proper divisors (8120495).

40409305 is a wasteful number, since it uses less digits than its factorization.

40409305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6443.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 40409305 is about 6356.8313647603. The cubic root of 40409305 is about 343.1577358469.

Adding to 40409305 its reverse (50390404), we get a palindrome (90799709).

The spelling of 40409305 in words is "forty million, four hundred nine thousand, three hundred five".