40289305 has 32 divisors (see below), whose sum is σ = 57950208. Its totient is φ = 26308800.

The previous prime is 40289297. The next prime is 40289309. The reversal of 40289305 is 50398204.

It is not a de Polignac number, because 40289305 - 2³ = 40289297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40289309) 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 31 ways as a sum of consecutive naturals, for example, 76774 + ... + 77296.

It is an arithmetic number, because the mean of its divisors is an integer number (1810944).

Almost surely, 2^40289305 is an apocalyptic number.

It is an amenable number.

40289305 is a deficient number, since it is larger than the sum of its proper divisors (17660903).

40289305 is a wasteful number, since it uses less digits than its factorization.

40289305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 40289305 is about 6347.3856823105. The cubic root of 40289305 is about 342.8177171514.

The spelling of 40289305 in words is "forty million, two hundred eighty-nine thousand, three hundred five".