40090009 has 4 divisors (see below), whose sum is σ = 40120704. Its totient is φ = 40059316.

The previous prime is 40089991. The next prime is 40090021. The reversal of 40090009 is 90009004.

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 40090009 - 2²⁵ = 6535577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40090049) 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, 13297 + ... + 16030.

It is an arithmetic number, because the mean of its divisors is an integer number (10030176).

Almost surely, 2^40090009 is an apocalyptic number.

It is an amenable number.

40090009 is a deficient number, since it is larger than the sum of its proper divisors (30695).

40090009 is a wasteful number, since it uses less digits than its factorization.

40090009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30694.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 40090009 is about 6331.6671580240. The cubic root of 40090009 is about 342.2515192064.

It can be divided in two parts, 400 and 90009, that added together give a palindrome (90409).

The spelling of 40090009 in words is "forty million, ninety thousand, nine".