40040020509 has 16 divisors (see below), whose sum is σ = 53477311104. Its totient is φ = 26648081600.

The previous prime is 40040020459. The next prime is 40040020513. The reversal of 40040020509 is 90502004004.

It is a cyclic number.

It is not a de Polignac number, because 40040020509 - 2¹⁹ = 40039496221 is a prime.

It is a super-2 number, since 2×40040020509² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040020589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4860424 + ... + 4868654.

It is an arithmetic number, because the mean of its divisors is an integer number (3342331944).

Almost surely, 2^40040020509 is an apocalyptic number.

It is an amenable number.

40040020509 is a deficient number, since it is larger than the sum of its proper divisors (13437290595).

40040020509 is a wasteful number, since it uses less digits than its factorization.

40040020509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10788.

The product of its (nonzero) digits is 1440, while the sum is 24.

The spelling of 40040020509 in words is "forty billion, forty million, twenty thousand, five hundred nine".