40287231 has 12 divisors (see below), whose sum is σ = 58261320. Its totient is φ = 26826480.

The previous prime is 40287223. The next prime is 40287241. The reversal of 40287231 is 13278204.

It is not a de Polignac number, because 40287231 - 2³ = 40287223 is a prime.

It is a super-2 number, since 2×40287231² = 3246121963294722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 40287195 and 40287204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40287241) 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 11 ways as a sum of consecutive naturals, for example, 7440 + ... + 11658.

It is an arithmetic number, because the mean of its divisors is an integer number (4855110).

Almost surely, 2^40287231 is an apocalyptic number.

40287231 is a deficient number, since it is larger than the sum of its proper divisors (17974089).

40287231 is a wasteful number, since it uses less digits than its factorization.

40287231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286 (or 5283 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 40287231 is about 6347.2223058595. Note that the first 3 decimals coincide. The cubic root of 40287231 is about 342.8118345634.

The spelling of 40287231 in words is "forty million, two hundred eighty-seven thousand, two hundred thirty-one".