40185657293 has 4 divisors (see below), whose sum is σ = 41932859808. Its totient is φ = 38438454780.

The previous prime is 40185657289. The next prime is 40185657299. The reversal of 40185657293 is 39275658104.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40185657293 - 2² = 40185657289 is a prime.

It is a super-2 number, since 2×40185657293² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40185657299) 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 3 ways as a sum of consecutive naturals, for example, 873601223 + ... + 873601268.

It is an arithmetic number, because the mean of its divisors is an integer number (10483214952).

It is a 1-persistent number, because it is pandigital, but 2⋅40185657293 = 80371314586 is not.

Almost surely, 2^40185657293 is an apocalyptic number.

It is an amenable number.

40185657293 is a deficient number, since it is larger than the sum of its proper divisors (1747202515).

40185657293 is a wasteful number, since it uses less digits than its factorization.

40185657293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747202514.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 40185657293 in words is "forty billion, one hundred eighty-five million, six hundred fifty-seven thousand, two hundred ninety-three".