40840369 has 4 divisors (see below), whose sum is σ = 41610996. Its totient is φ = 40069744.

The previous prime is 40840363. The next prime is 40840379. The reversal of 40840369 is 96304804.

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 36759969 + 4080400 = 6063^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 40840369 - 2¹⁵ = 40807601 is a prime.

It is a super-3 number, since 3×40840369³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40840363) 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, 385234 + ... + 385339.

It is an arithmetic number, because the mean of its divisors is an integer number (10402749).

Almost surely, 2^40840369 is an apocalyptic number.

It is an amenable number.

40840369 is a deficient number, since it is larger than the sum of its proper divisors (770627).

40840369 is an equidigital number, since it uses as much as digits as its factorization.

40840369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770626.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 40840369 is about 6390.6469938497. The cubic root of 40840369 is about 344.3736278702.

It can be divided in two parts, 40840 and 369, that added together give a square (41209 = 203²).

The spelling of 40840369 in words is "forty million, eight hundred forty thousand, three hundred sixty-nine".