402398893728 has 144 divisors (see below), whose sum is σ = 1244312334720. Its totient is φ = 122612838912.

The previous prime is 402398893723. The next prime is 402398893751. The reversal of 402398893728 is 827398893204.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (402398893723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136108 + ... + 907371.

It is an arithmetic number, because the mean of its divisors is an integer number (8641057880).

Almost surely, 2^402398893728 is an apocalyptic number.

402398893728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402398893728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (622156167360).

402398893728 is an abundant number, since it is smaller than the sum of its proper divisors (841913440992).

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

402398893728 is a wasteful number, since it uses less digits than its factorization.

402398893728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043611 (or 1043600 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 63.

The spelling of 402398893728 in words is "four hundred two billion, three hundred ninety-eight million, eight hundred ninety-three thousand, seven hundred twenty-eight".