842139824402 has 54 divisors (see below), whose sum is σ = 1339750130943. Its totient is φ = 396980834624.

The previous prime is 842139824399. The next prime is 842139824413. The reversal of 842139824402 is 204428931248.

It can be written as a sum of positive squares in 5 ways, for example, as 7253758561 + 834886065841 = 85169^2 + 913721^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=648899.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2656592348 + ... + 2656592664.

Almost surely, 2^842139824402 is an apocalyptic number.

842139824402 is a deficient number, since it is larger than the sum of its proper divisors (497610306541).

842139824402 is an frugal number, since it uses more digits than its factorization.

842139824402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 47.

The spelling of 842139824402 in words is "eight hundred forty-two billion, one hundred thirty-nine million, eight hundred twenty-four thousand, four hundred two".