40389685091 has 4 divisors (see below), whose sum is σ = 46159640112. Its totient is φ = 34619730072.

The previous prime is 40389685087. The next prime is 40389685099. The reversal of 40389685091 is 19058698304.

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 40389685091 - 2² = 40389685087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40389685099) 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, 2884977500 + ... + 2884977513.

It is an arithmetic number, because the mean of its divisors is an integer number (11539910028).

Almost surely, 2^40389685091 is an apocalyptic number.

40389685091 is a deficient number, since it is larger than the sum of its proper divisors (5769955021).

40389685091 is an equidigital number, since it uses as much as digits as its factorization.

40389685091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5769955020.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 40389685091 in words is "forty billion, three hundred eighty-nine million, six hundred eighty-five thousand, ninety-one".