402331243 has 2 divisors, whose sum is σ = 402331244. Its totient is φ = 402331242.

The previous prime is 402331217. The next prime is 402331247. The reversal of 402331243 is 342133204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402331243 - 2¹⁷ = 402200171 is a prime.

It is not a weakly prime, because it can be changed into another prime (402331247) 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, 201165621 + 201165622.

It is an arithmetic number, because the mean of its divisors is an integer number (201165622).

Almost surely, 2^402331243 is an apocalyptic number.

402331243 is a deficient number, since it is larger than the sum of its proper divisors (1).

402331243 is an equidigital number, since it uses as much as digits as its factorization.

402331243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 402331243 is about 20058.1964044627. The cubic root of 402331243 is about 738.2349233619.

Adding to 402331243 its reverse (342133204), we get a palindrome (744464447).

The spelling of 402331243 in words is "four hundred two million, three hundred thirty-one thousand, two hundred forty-three".