40138061281 has 8 divisors (see below), whose sum is σ = 40313658240. Its totient is φ = 39962528592.

The previous prime is 40138061269. The next prime is 40138061303. The reversal of 40138061281 is 18216083104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40138061281 is a prime.

It is a super-2 number, since 2×40138061281² (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 (40138061261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577446 + ... + 1602688.

It is an arithmetic number, because the mean of its divisors is an integer number (5039207280).

Almost surely, 2^40138061281 is an apocalyptic number.

It is an amenable number.

40138061281 is a deficient number, since it is larger than the sum of its proper divisors (175596959).

40138061281 is a wasteful number, since it uses less digits than its factorization.

40138061281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32135.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 40138061281 in words is "forty billion, one hundred thirty-eight million, sixty-one thousand, two hundred eighty-one".