40056609 has 4 divisors (see below), whose sum is σ = 53408816. Its totient is φ = 26704404.

The previous prime is 40056589. The next prime is 40056613. The reversal of 40056609 is 90665004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40056609 - 2⁷ = 40056481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40056629) 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, 6676099 + ... + 6676104.

It is an arithmetic number, because the mean of its divisors is an integer number (13352204).

Almost surely, 2^40056609 is an apocalyptic number.

It is an amenable number.

40056609 is a deficient number, since it is larger than the sum of its proper divisors (13352207).

40056609 is a wasteful number, since it uses less digits than its factorization.

40056609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13352206.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 40056609 is about 6329.0290724565. The cubic root of 40056609 is about 342.1564466681.

The spelling of 40056609 in words is "forty million, fifty-six thousand, six hundred nine".