402421442490 has 64 divisors (see below), whose sum is σ = 1086707750400. Its totient is φ = 105953994432.

The previous prime is 402421442393. The next prime is 402421442491. The reversal of 402421442490 is 94244124204.

402421442490 is a `hidden beast` number, since 4 + 0 + 24 + 2 + 144 + 2 + 490 = 666.

It is not an unprimeable number, because it can be changed into a prime (402421442491) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9411897 + ... + 9454556.

It is an arithmetic number, because the mean of its divisors is an integer number (16979808600).

Almost surely, 2^402421442490 is an apocalyptic number.

402421442490 is an abundant number, since it is smaller than the sum of its proper divisors (684286307910).

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

402421442490 is a wasteful number, since it uses less digits than its factorization.

402421442490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18866548 (or 18866542 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

Adding to 402421442490 its reverse (94244124204), we get a palindrome (496665566694).

The spelling of 402421442490 in words is "four hundred two billion, four hundred twenty-one million, four hundred forty-two thousand, four hundred ninety".