40609519987 has 4 divisors (see below), whose sum is σ = 40628525176. Its totient is φ = 40590514800.

The previous prime is 40609519961. The next prime is 40609520051. The reversal of 40609519987 is 78991590604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40609519987 - 2²³ = 40601131379 is a prime.

It is a super-2 number, since 2×40609519987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40609519957) 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, 9499389 + ... + 9503662.

It is an arithmetic number, because the mean of its divisors is an integer number (10157131294).

Almost surely, 2^40609519987 is an apocalyptic number.

40609519987 is a deficient number, since it is larger than the sum of its proper divisors (19005189).

40609519987 is a wasteful number, since it uses less digits than its factorization.

40609519987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19005188.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 40609519987 in words is "forty billion, six hundred nine million, five hundred nineteen thousand, nine hundred eighty-seven".