19904412889 has 27 divisors (see below), whose sum is σ = 21760036893. Its totient is φ = 18203092992.

The previous prime is 19904412851. The next prime is 19904412907. The reversal of 19904412889 is 98821440991.

It is a happy number.

The square root of 19904412889 is 141083.

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

It can be written as a sum of positive squares in 4 ways, for example, as 12131289 + 19892281600 = 3483^2 + 141040^2 .

It is not a de Polignac number, because 19904412889 - 2⁹ = 19904412377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19904412809) 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 26 ways as a sum of consecutive naturals, for example, 103131577 + ... + 103131769.

Almost surely, 2^19904412889 is an apocalyptic number.

19904412889 is the 141083-rd square number.

19904412889 is the 70542-nd centered octagonal number.

It is an amenable number.

19904412889 is a deficient number, since it is larger than the sum of its proper divisors (1855624004).

19904412889 is an frugal number, since it uses more digits than its factorization.

19904412889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 19904412889 in words is "nineteen billion, nine hundred four million, four hundred twelve thousand, eight hundred eighty-nine".