402242042420 has 24 divisors (see below), whose sum is σ = 844734939048. Its totient is φ = 160891740800.

The previous prime is 402242042357. The next prime is 402242042431. The reversal of 402242042420 is 24240242204.

It can be written as a sum of positive squares in 4 ways, for example, as 42503594896 + 359738447524 = 206164^2 + 599782^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 402242042420.

It is a congruent number.

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, 368690 + ... + 969750.

It is an arithmetic number, because the mean of its divisors is an integer number (35197289127).

Almost surely, 2^402242042420 is an apocalyptic number.

It is an amenable number.

402242042420 is an abundant number, since it is smaller than the sum of its proper divisors (442492896628).

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

402242042420 is a wasteful number, since it uses less digits than its factorization.

402242042420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634531 (or 634529 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 402242042420 its reverse (24240242204), we get a palindrome (426482284624).

The spelling of 402242042420 in words is "four hundred two billion, two hundred forty-two million, forty-two thousand, four hundred twenty".