402040231 has 2 divisors, whose sum is σ = 402040232. Its totient is φ = 402040230.

The previous prime is 402040229. The next prime is 402040237. The reversal of 402040231 is 132040204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402040231 - 2¹ = 402040229 is a prime.

It is a super-2 number, since 2×402040231² = 323272694685066722, which contains 22 as substring.

Together with 402040229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402040237) 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 as a sum of consecutive naturals, namely, 201020115 + 201020116.

It is an arithmetic number, because the mean of its divisors is an integer number (201020116).

Almost surely, 2^402040231 is an apocalyptic number.

402040231 is a deficient number, since it is larger than the sum of its proper divisors (1).

402040231 is an equidigital number, since it uses as much as digits as its factorization.

402040231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 402040231 is about 20050.9409006161. The cubic root of 402040231 is about 738.0568884352.

Adding to 402040231 its reverse (132040204), we get a palindrome (534080435).

The spelling of 402040231 in words is "four hundred two million, forty thousand, two hundred thirty-one".