402328891 has 2 divisors, whose sum is σ = 402328892. Its totient is φ = 402328890.

The previous prime is 402328889. The next prime is 402328907. The reversal of 402328891 is 198823204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402328891 - 2¹ = 402328889 is a prime.

Together with 402328889, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 402328891.

It is not a weakly prime, because it can be changed into another prime (402328831) 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, 201164445 + 201164446.

It is an arithmetic number, because the mean of its divisors is an integer number (201164446).

Almost surely, 2^402328891 is an apocalyptic number.

402328891 is a deficient number, since it is larger than the sum of its proper divisors (1).

402328891 is an equidigital number, since it uses as much as digits as its factorization.

402328891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 402328891 is about 20058.1377749780. The cubic root of 402328891 is about 738.2334848027.

The spelling of 402328891 in words is "four hundred two million, three hundred twenty-eight thousand, eight hundred ninety-one".