40400001781 has 8 divisors (see below), whose sum is σ = 43191779904. Its totient is φ = 37654368960.

The previous prime is 40400001773. The next prime is 40400001799. The reversal of 40400001781 is 18710000404.

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

It is not a de Polignac number, because 40400001781 - 2³ = 40400001773 is a prime.

It is a super-2 number, since 2×40400001781² (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 (40400005781) 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, 11534515 + ... + 11538016.

It is an arithmetic number, because the mean of its divisors is an integer number (5398972488).

Almost surely, 2^40400001781 is an apocalyptic number.

It is an amenable number.

40400001781 is a deficient number, since it is larger than the sum of its proper divisors (2791778123).

40400001781 is a wasteful number, since it uses less digits than its factorization.

40400001781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23072651.

The product of its (nonzero) digits is 896, while the sum is 25.

The spelling of 40400001781 in words is "forty billion, four hundred million, one thousand, seven hundred eighty-one".