40528909 has 4 divisors (see below), whose sum is σ = 40984380. Its totient is φ = 40073440.

The previous prime is 40528897. The next prime is 40528963. The reversal of 40528909 is 90982504.

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 5978025 + 34550884 = 2445^2 + 5878^2 .

It is a cyclic number.

It is not a de Polignac number, because 40528909 - 2⁷ = 40528781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40528009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227602 + ... + 227779.

It is an arithmetic number, because the mean of its divisors is an integer number (10246095).

Almost surely, 2^40528909 is an apocalyptic number.

It is an amenable number.

40528909 is a deficient number, since it is larger than the sum of its proper divisors (455471).

40528909 is an equidigital number, since it uses as much as digits as its factorization.

40528909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455470.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 40528909 is about 6366.2319310562. The cubic root of 40528909 is about 343.4959633174.

The spelling of 40528909 in words is "forty million, five hundred twenty-eight thousand, nine hundred nine".