40185343421 has 4 divisors (see below), whose sum is σ = 40360825500. Its totient is φ = 40009861344.

The previous prime is 40185343417. The next prime is 40185343423. The reversal of 40185343421 is 12434358104.

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 15897679396 + 24287664025 = 126086^2 + 155845^2 .

It is a cyclic number.

It is not a de Polignac number, because 40185343421 - 2² = 40185343417 is a prime.

It is a super-2 number, since 2×40185343421² (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 (40185343423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87740696 + ... + 87741153.

It is an arithmetic number, because the mean of its divisors is an integer number (10090206375).

Almost surely, 2^40185343421 is an apocalyptic number.

It is an amenable number.

40185343421 is a deficient number, since it is larger than the sum of its proper divisors (175482079).

40185343421 is a wasteful number, since it uses less digits than its factorization.

40185343421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175482078.

The product of its (nonzero) digits is 46080, while the sum is 35.

The spelling of 40185343421 in words is "forty billion, one hundred eighty-five million, three hundred forty-three thousand, four hundred twenty-one".