40138689591 has 192 divisors, whose sum is σ = 83786711040. Its totient is φ = 18406776960.

The previous prime is 40138689583. The next prime is 40138689593. The reversal of 40138689591 is 19598683104.

40138689591 is a `hidden beast` number, since 40 + 1 + 3 + 8 + 6 + 8 + 9 + 591 = 666.

It is not a de Polignac number, because 40138689591 - 2³ = 40138689583 is a prime.

It is a super-2 number, since 2×40138689591² (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 (40138689593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 8078590 + ... + 8083556.

It is an arithmetic number, because the mean of its divisors is an integer number (436389120).

Almost surely, 2^40138689591 is an apocalyptic number.

40138689591 is an abundant number, since it is smaller than the sum of its proper divisors (43648021449).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40138689591 is a wasteful number, since it uses less digits than its factorization.

40138689591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043 (or 5024 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 40138689591 in words is "forty billion, one hundred thirty-eight million, six hundred eighty-nine thousand, five hundred ninety-one".