40090909 has 8 divisors (see below), whose sum is σ = 42340032. Its totient is φ = 37884000.

The previous prime is 40090903. The next prime is 40090933. The reversal of 40090909 is 90909004.

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 40090909 - 2³ = 40090901 is a prime.

It is a Duffinian number.

40090909 is a modest number, since divided by 90909 gives 40 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40090901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8592 + ... + 12409.

It is an arithmetic number, because the mean of its divisors is an integer number (5292504).

Almost surely, 2^40090909 is an apocalyptic number.

It is an amenable number.

40090909 is a deficient number, since it is larger than the sum of its proper divisors (2249123).

40090909 is a wasteful number, since it uses less digits than its factorization.

40090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21107.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 40090909 is about 6331.7382289542. The cubic root of 40090909 is about 342.2540803105.

The spelling of 40090909 in words is "forty million, ninety thousand, nine hundred nine".