40340561 has 4 divisors (see below), whose sum is σ = 40456500. Its totient is φ = 40224624.

The previous prime is 40340557. The next prime is 40340563. The reversal of 40340561 is 16504304.

It is a happy number.

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 32947600 + 7392961 = 5740^2 + 2719^2 .

It is a cyclic number.

It is not a de Polignac number, because 40340561 - 2² = 40340557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40340563) 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, 57446 + ... + 58143.

It is an arithmetic number, because the mean of its divisors is an integer number (10114125).

Almost surely, 2^40340561 is an apocalyptic number.

It is an amenable number.

40340561 is a deficient number, since it is larger than the sum of its proper divisors (115939).

40340561 is a wasteful number, since it uses less digits than its factorization.

40340561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115938.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 40340561 is about 6351.4219667725. The cubic root of 40340561 is about 342.9630329592.

Adding to 40340561 its reverse (16504304), we get a palindrome (56844865).

The spelling of 40340561 in words is "forty million, three hundred forty thousand, five hundred sixty-one".