402040330420 has 24 divisors (see below), whose sum is σ = 848570411304. Its totient is φ = 159999805056.

The previous prime is 402040330361. The next prime is 402040330421. The reversal of 402040330420 is 24033040204.

It can be written as a sum of positive squares in 4 ways, for example, as 132178782096 + 269861548324 = 363564^2 + 519482^2 .

It is a junction number, because it is equal to n+sod(n) for n = 402040330391 and 402040330400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402040330421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51016407 + ... + 51024286.

It is an arithmetic number, because the mean of its divisors is an integer number (35357100471).

Almost surely, 2^402040330420 is an apocalyptic number.

It is an amenable number.

402040330420 is an abundant number, since it is smaller than the sum of its proper divisors (446530080884).

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

402040330420 is a wasteful number, since it uses less digits than its factorization.

402040330420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102040899 (or 102040897 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

Adding to 402040330420 its reverse (24033040204), we get a palindrome (426073370624).

The spelling of 402040330420 in words is "four hundred two billion, forty million, three hundred thirty thousand, four hundred twenty".