40199809 has 8 divisors (see below), whose sum is σ = 43341480. Its totient is φ = 37065216.

The previous prime is 40199759. The next prime is 40199821. The reversal of 40199809 is 90899104.

It can be written as a sum of positive squares in 4 ways, for example, as 547600 + 39652209 = 740^2 + 6297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40199809 - 2¹³ = 40191617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40199879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20337 + ... + 22225.

It is an arithmetic number, because the mean of its divisors is an integer number (5417685).

Almost surely, 2^40199809 is an apocalyptic number.

It is an amenable number.

40199809 is a deficient number, since it is larger than the sum of its proper divisors (3141671).

40199809 is a wasteful number, since it uses less digits than its factorization.

40199809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 40199809 is about 6340.3319313739. The cubic root of 40199809 is about 342.5636914248.

The spelling of 40199809 in words is "forty million, one hundred ninety-nine thousand, eight hundred nine".