402223391 has 2 divisors, whose sum is σ = 402223392. Its totient is φ = 402223390.

The previous prime is 402223363. The next prime is 402223397. The reversal of 402223391 is 193322204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402223391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402223391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402223397) 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, 201111695 + 201111696.

It is an arithmetic number, because the mean of its divisors is an integer number (201111696).

Almost surely, 2^402223391 is an apocalyptic number.

402223391 is a deficient number, since it is larger than the sum of its proper divisors (1).

402223391 is an equidigital number, since it uses as much as digits as its factorization.

402223391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 402223391 is about 20055.5077472499. The cubic root of 402223391 is about 738.1689518274.

Adding to 402223391 its reverse (193322204), we get a palindrome (595545595).

The spelling of 402223391 in words is "four hundred two million, two hundred twenty-three thousand, three hundred ninety-one".