402448840 has 16 divisors (see below), whose sum is σ = 905509980. Its totient is φ = 160979520.

The previous prime is 402448817. The next prime is 402448847. The reversal of 402448840 is 48844204.

It can be written as a sum of positive squares in 2 ways, for example, as 370254564 + 32194276 = 19242^2 + 5674^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402448796 and 402448805.

It is not an unprimeable number, because it can be changed into a prime (402448847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5030571 + ... + 5030650.

Almost surely, 2^402448840 is an apocalyptic number.

402448840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402448840 is an abundant number, since it is smaller than the sum of its proper divisors (503061140).

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

402448840 is a wasteful number, since it uses less digits than its factorization.

402448840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061232 (or 10061228 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 34.

The square root of 402448840 is about 20061.1275854574. The cubic root of 402448840 is about 738.3068423399.

The spelling of 402448840 in words is "four hundred two million, four hundred forty-eight thousand, eight hundred forty".