40187868639 has 16 divisors (see below), whose sum is σ = 56408330880. Its totient is φ = 25379874720.

The previous prime is 40187868619. The next prime is 40187868667. The reversal of 40187868639 is 93686878104.

It is not a de Polignac number, because 40187868639 - 2²³ = 40179480031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40187868619) 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, 1270929 + ... + 1302165.

It is an arithmetic number, because the mean of its divisors is an integer number (3525520680).

Almost surely, 2^40187868639 is an apocalyptic number.

40187868639 is a deficient number, since it is larger than the sum of its proper divisors (16220462241).

40187868639 is a wasteful number, since it uses less digits than its factorization.

40187868639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53830.

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 40187868639 in words is "forty billion, one hundred eighty-seven million, eight hundred sixty-eight thousand, six hundred thirty-nine".