40001172381 has 8 divisors (see below), whose sum is σ = 59260996160. Its totient is φ = 26667448236.

The previous prime is 40001172373. The next prime is 40001172443. The reversal of 40001172381 is 18327110004.

It is not a de Polignac number, because 40001172381 - 2³ = 40001172373 is a prime.

It is a super-2 number, since 2×40001172381² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1481524903 = 40001172381 / (4 + 0 + 0 + 0 + 1 + 1 + 7 + 2 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40001172481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740762425 + ... + 740762478.

It is an arithmetic number, because the mean of its divisors is an integer number (7407624520).

Almost surely, 2^40001172381 is an apocalyptic number.

It is an amenable number.

40001172381 is a deficient number, since it is larger than the sum of its proper divisors (19259823779).

40001172381 is a wasteful number, since it uses less digits than its factorization.

40001172381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481524912 (or 1481524906 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

Adding to 40001172381 its reverse (18327110004), we get a palindrome (58328282385).

The spelling of 40001172381 in words is "forty billion, one million, one hundred seventy-two thousand, three hundred eighty-one".