40185685 has 4 divisors (see below), whose sum is σ = 48222828. Its totient is φ = 32148544.

The previous prime is 40185661. The next prime is 40185689. The reversal of 40185685 is 58658104.

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 4866436 + 35319249 = 2206^2 + 5943^2 .

It is a cyclic number.

It is not a de Polignac number, because 40185685 - 2⁵ = 40185653 is a prime.

It is a super-2 number, since 2×40185685² = 3229778557838450, which 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 (40185689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4018564 + ... + 4018573.

It is an arithmetic number, because the mean of its divisors is an integer number (12055707).

Almost surely, 2^40185685 is an apocalyptic number.

It is an amenable number.

40185685 is a deficient number, since it is larger than the sum of its proper divisors (8037143).

40185685 is an equidigital number, since it uses as much as digits as its factorization.

40185685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8037142.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 40185685 is about 6339.2180117109. The cubic root of 40185685 is about 342.5235673839.

The spelling of 40185685 in words is "forty million, one hundred eighty-five thousand, six hundred eighty-five".