40445909 has 4 divisors (see below), whose sum is σ = 46223904. Its totient is φ = 34667916.

The previous prime is 40445903. The next prime is 40445953. The reversal of 40445909 is 90954404.

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 a cyclic number.

It is not a de Polignac number, because 40445909 - 2⁸ = 40445653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40445903) 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, 2888987 + ... + 2889000.

It is an arithmetic number, because the mean of its divisors is an integer number (11555976).

Almost surely, 2^40445909 is an apocalyptic number.

It is an amenable number.

40445909 is a deficient number, since it is larger than the sum of its proper divisors (5777995).

40445909 is an equidigital number, since it uses as much as digits as its factorization.

40445909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5777994.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 40445909 is about 6359.7098204242. The cubic root of 40445909 is about 343.2613188786.

The spelling of 40445909 in words is "forty million, four hundred forty-five thousand, nine hundred nine".