402490005242 has 16 divisors (see below), whose sum is σ = 672596031240. Its totient is φ = 179358940992.

The previous prime is 402490005221. The next prime is 402490005289. The reversal of 402490005242 is 242500094204.

It is a Cunningham number, because it is equal to 634421²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 350879707201 + 51610298041 = 592351^2 + 227179^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402490005199 and 402490005208.

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, 266902433 + ... + 266903940.

Almost surely, 2^402490005242 is an apocalyptic number.

402490005242 is a deficient number, since it is larger than the sum of its proper divisors (270106025998).

402490005242 is a wasteful number, since it uses less digits than its factorization.

402490005242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533806417.

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 402490005242 its reverse (242500094204), we get a palindrome (644990099446).

The spelling of 402490005242 in words is "four hundred two billion, four hundred ninety million, five thousand, two hundred forty-two".