19402818436 has 27 divisors (see below), whose sum is σ = 34213815237. Its totient is φ = 9628001280.

The previous prime is 19402818433. The next prime is 19402818493. The reversal of 19402818436 is 63481820491.

The square root of 19402818436 is 139294.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19102004100 + 300814336 = 138210^2 + 17344^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19402818433) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 71596981 + ... + 71597251.

Almost surely, 2^19402818436 is an apocalyptic number.

19402818436 is the 139294-th square number.

It is an amenable number.

19402818436 is a deficient number, since it is larger than the sum of its proper divisors (14810996801).

19402818436 is an frugal number, since it uses more digits than its factorization.

19402818436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 19402818436 in words is "nineteen billion, four hundred two million, eight hundred eighteen thousand, four hundred thirty-six".