402489856 has 40 divisors (see below), whose sum is σ = 806029884. Its totient is φ = 200785920.

The previous prime is 402489839. The next prime is 402489859. The reversal of 402489856 is 658984204.

It can be written as a sum of positive squares in 2 ways, for example, as 400640256 + 1849600 = 20016^2 + 1360^2 .

It is not an unprimeable number, because it can be changed into a prime (402489859) 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 in 3 ways as a sum of consecutive naturals, for example, 389116 + ... + 390148.

Almost surely, 2^402489856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402489856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403014942).

402489856 is an abundant number, since it is smaller than the sum of its proper divisors (403540028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402489856 is an equidigital number, since it uses as much as digits as its factorization.

402489856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1796 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The square root of 402489856 is about 20062.1498349504. The cubic root of 402489856 is about 738.3319232626.

The spelling of 402489856 in words is "four hundred two million, four hundred eighty-nine thousand, eight hundred fifty-six".