402821042449 has 6 divisors (see below), whose sum is σ = 468587743314. Its totient is φ = 345275179200.

The previous prime is 402821042447. The next prime is 402821042509. The reversal of 402821042449 is 944240128204.

It can be written as a sum of positive squares in only one way, i.e., 402342833025 + 478209424 = 634305^2 + 21868^2 .

It is not a de Polignac number, because 402821042449 - 2¹ = 402821042447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402821042447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4110418752 + ... + 4110418849.

It is an arithmetic number, because the mean of its divisors is an integer number (78097957219).

Almost surely, 2^402821042449 is an apocalyptic number.

402821042449 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

402821042449 is a deficient number, since it is larger than the sum of its proper divisors (65766700865).

402821042449 is an equidigital number, since it uses as much as digits as its factorization.

402821042449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8220837615 (or 8220837608 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 402821042449 in words is "four hundred two billion, eight hundred twenty-one million, forty-two thousand, four hundred forty-nine".