40430561 has 4 divisors (see below), whose sum is σ = 40574724. Its totient is φ = 40286400.

The previous prime is 40430557. The next prime is 40430563. The reversal of 40430561 is 16503404.

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 14776336 + 25654225 = 3844^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 40430561 - 2² = 40430557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40430563) 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, 71660 + ... + 72221.

It is an arithmetic number, because the mean of its divisors is an integer number (10143681).

Almost surely, 2^40430561 is an apocalyptic number.

It is an amenable number.

40430561 is a deficient number, since it is larger than the sum of its proper divisors (144163).

40430561 is a wasteful number, since it uses less digits than its factorization.

40430561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144162.

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

The square root of 40430561 is about 6358.5030471016. The cubic root of 40430561 is about 343.2178942869.

Adding to 40430561 its reverse (16503404), we get a palindrome (56933965).

The spelling of 40430561 in words is "forty million, four hundred thirty thousand, five hundred sixty-one".