402828661 has 2 divisors, whose sum is σ = 402828662. Its totient is φ = 402828660.

The previous prime is 402828641. The next prime is 402828677. The reversal of 402828661 is 166828204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349465636 + 53363025 = 18694^2 + 7305^2 .

It is a cyclic number.

It is not a de Polignac number, because 402828661 - 2⁹ = 402828149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402828661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402828641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201414330 + 201414331.

It is an arithmetic number, because the mean of its divisors is an integer number (201414331).

Almost surely, 2^402828661 is an apocalyptic number.

It is an amenable number.

402828661 is a deficient number, since it is larger than the sum of its proper divisors (1).

402828661 is an equidigital number, since it uses as much as digits as its factorization.

402828661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 402828661 is about 20070.5919444345. The cubic root of 402828661 is about 738.5390343954.

The spelling of 402828661 in words is "four hundred two million, eight hundred twenty-eight thousand, six hundred sixty-one".