40288231 has 2 divisors, whose sum is σ = 40288232. Its totient is φ = 40288230.

The previous prime is 40288223. The next prime is 40288267. The reversal of 40288231 is 13288204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40288231 - 2³ = 40288223 is a prime.

It is a super-2 number, since 2×40288231² = 3246283114218722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40288231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40288331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20144115 + 20144116.

It is an arithmetic number, because the mean of its divisors is an integer number (20144116).

Almost surely, 2^40288231 is an apocalyptic number.

40288231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40288231 is an equidigital number, since it uses as much as digits as its factorization.

40288231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 40288231 is about 6347.3010799867. The cubic root of 40288231 is about 342.8146709377.

The spelling of 40288231 in words is "forty million, two hundred eighty-eight thousand, two hundred thirty-one".