402442420240 has 40 divisors (see below), whose sum is σ = 1069347003840. Its totient is φ = 137980258176.

The previous prime is 402442420223. The next prime is 402442420277. The reversal of 402442420240 is 42024244204.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 402442420199 and 402442420208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359323030 + ... + 359324149.

It is an arithmetic number, because the mean of its divisors is an integer number (26733675096).

Almost surely, 2^402442420240 is an apocalyptic number.

402442420240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402442420240 is an abundant number, since it is smaller than the sum of its proper divisors (666904583600).

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

402442420240 is a wasteful number, since it uses less digits than its factorization.

402442420240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718647199 (or 718647193 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 402442420240 its reverse (42024244204), we get a palindrome (444466664444).

The spelling of 402442420240 in words is "four hundred two billion, four hundred forty-two million, four hundred twenty thousand, two hundred forty".