402428231 has 2 divisors, whose sum is σ = 402428232. Its totient is φ = 402428230.

The previous prime is 402428207. The next prime is 402428237. The reversal of 402428231 is 132824204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402428231 - 2⁶ = 402428167 is a prime.

It is a super-2 number, since 2×402428231² = 323896962211578722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402428231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402428237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201214115 + 201214116.

It is an arithmetic number, because the mean of its divisors is an integer number (201214116).

Almost surely, 2^402428231 is an apocalyptic number.

402428231 is a deficient number, since it is larger than the sum of its proper divisors (1).

402428231 is an equidigital number, since it uses as much as digits as its factorization.

402428231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 402428231 is about 20060.6139238060. The cubic root of 402428231 is about 738.2942394747.

The spelling of 402428231 in words is "four hundred two million, four hundred twenty-eight thousand, two hundred thirty-one".