40047746381 has 4 divisors (see below), whose sum is σ = 40049672892. Its totient is φ = 40045819872.

The previous prime is 40047746363. The next prime is 40047746407. The reversal of 40047746381 is 18364774004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2592337225 + 37455409156 = 50915^2 + 193534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40047746381 is a prime.

It is a super-2 number, since 2×40047746381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40047046381) 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, 931730 + ... + 973763.

It is an arithmetic number, because the mean of its divisors is an integer number (10012418223).

Almost surely, 2^40047746381 is an apocalyptic number.

It is an amenable number.

40047746381 is a deficient number, since it is larger than the sum of its proper divisors (1926511).

40047746381 is a wasteful number, since it uses less digits than its factorization.

40047746381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1926510.

The product of its (nonzero) digits is 451584, while the sum is 44.

The spelling of 40047746381 in words is "forty billion, forty-seven million, seven hundred forty-six thousand, three hundred eighty-one".