40245438181 has 8 divisors (see below), whose sum is σ = 43353475704. Its totient is φ = 37139148480.

The previous prime is 40245438143. The next prime is 40245438271. The reversal of 40245438181 is 18183454204.

It can be written as a sum of positive squares in 4 ways, for example, as 697752225 + 39547685956 = 26415^2 + 198866^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40245438181 - 2⁹ = 40245437669 is a prime.

It is a super-2 number, since 2×40245438181² (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 (40245438131) 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 7 ways as a sum of consecutive naturals, for example, 388930 + ... + 481411.

It is an arithmetic number, because the mean of its divisors is an integer number (5419184463).

Almost surely, 2^40245438181 is an apocalyptic number.

It is an amenable number.

40245438181 is a deficient number, since it is larger than the sum of its proper divisors (3108037523).

40245438181 is a wasteful number, since it uses less digits than its factorization.

40245438181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873911.

The product of its (nonzero) digits is 122880, while the sum is 40.

The spelling of 40245438181 in words is "forty billion, two hundred forty-five million, four hundred thirty-eight thousand, one hundred eighty-one".