402443131402 has 16 divisors (see below), whose sum is σ = 650113270632. Its totient is φ = 185739318720.

The previous prime is 402443131397. The next prime is 402443131403. The reversal of 402443131402 is 204131344204.

It can be written as a sum of positive squares in 4 ways, for example, as 266482055961 + 135961075441 = 516219^2 + 368729^2 .

It is not an unprimeable number, because it can be changed into a prime (402443131403) 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, 1547452 + ... + 1788712.

Almost surely, 2^402443131402 is an apocalyptic number.

402443131402 is a deficient number, since it is larger than the sum of its proper divisors (247670139230).

402443131402 is a wasteful number, since it uses less digits than its factorization.

402443131402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305433.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 402443131402 its reverse (204131344204), we get a palindrome (606574475606).

The spelling of 402443131402 in words is "four hundred two billion, four hundred forty-three million, one hundred thirty-one thousand, four hundred two".