402100823 has 2 divisors, whose sum is σ = 402100824. Its totient is φ = 402100822.

The previous prime is 402100807. The next prime is 402100859. The reversal of 402100823 is 328001204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402100823 - 2⁴ = 402100807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 402100795 and 402100804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402100873) 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, 201050411 + 201050412.

It is an arithmetic number, because the mean of its divisors is an integer number (201050412).

Almost surely, 2^402100823 is an apocalyptic number.

402100823 is a deficient number, since it is larger than the sum of its proper divisors (1).

402100823 is an equidigital number, since it uses as much as digits as its factorization.

402100823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 402100823 is about 20052.4517952294. The cubic root of 402100823 is about 738.0939644068.

The spelling of 402100823 in words is "four hundred two million, one hundred thousand, eight hundred twenty-three".