40909144185 has 96 divisors (see below), whose sum is σ = 88919970048. Its totient is φ = 16936957440.

The previous prime is 40909144163. The next prime is 40909144187. The reversal of 40909144185 is 58144190904.

It is a happy number.

40909144185 is a `hidden beast` number, since 40 + 9 + 0 + 91 + 441 + 85 = 666.

It is not a de Polignac number, because 40909144185 - 2¹⁶ = 40909078649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 40909144185.

It is not an unprimeable number, because it can be changed into a prime (40909144187) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 122790 + ... + 311280.

It is an arithmetic number, because the mean of its divisors is an integer number (926249688).

Almost surely, 2^40909144185 is an apocalyptic number.

40909144185 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40909144185 is an abundant number, since it is smaller than the sum of its proper divisors (48010825863).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40909144185 is a wasteful number, since it uses less digits than its factorization.

40909144185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188575 (or 188572 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 40909144185 in words is "forty billion, nine hundred nine million, one hundred forty-four thousand, one hundred eighty-five".