19939134436 has 27 divisors (see below), whose sum is σ = 37791028233. Its totient is φ = 9200982960.

The previous prime is 19939134433. The next prime is 19939134461. The reversal of 19939134436 is 63443193991.

The square root of 19939134436 is 141206.

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., 2949576100 + 16989558336 = 54310^2 + 130344^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19939134431) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 3668641 + ... + 3674071.

Almost surely, 2^19939134436 is an apocalyptic number.

19939134436 is the 141206-th square number.

It is an amenable number.

19939134436 is a deficient number, since it is larger than the sum of its proper divisors (17851893797).

19939134436 is an frugal number, since it uses more digits than its factorization.

19939134436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10892 (or 5446 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 52.

The spelling of 19939134436 in words is "nineteen billion, nine hundred thirty-nine million, one hundred thirty-four thousand, four hundred thirty-six".