40520569 has 4 divisors (see below), whose sum is σ = 41917860. Its totient is φ = 39123280.

The previous prime is 40520561. The next prime is 40520581. The reversal of 40520569 is 96502504.

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 33698025 + 6822544 = 5805^2 + 2612^2 .

It is a cyclic number.

It is not a de Polignac number, because 40520569 - 2³ = 40520561 is a prime.

It is a super-2 number, since 2×40520569² = 3283833024167522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40520569.

It is not an unprimeable number, because it can be changed into a prime (40520561) 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, 698602 + ... + 698659.

It is an arithmetic number, because the mean of its divisors is an integer number (10479465).

Almost surely, 2^40520569 is an apocalyptic number.

It is an amenable number.

40520569 is a deficient number, since it is larger than the sum of its proper divisors (1397291).

40520569 is a wasteful number, since it uses less digits than its factorization.

40520569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1397290.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 40520569 is about 6365.5768788068. The cubic root of 40520569 is about 343.4724002778.

The spelling of 40520569 in words is "forty million, five hundred twenty thousand, five hundred sixty-nine".