1889368458849 has 21 divisors (see below), whose sum is σ = 2832812469763. Its totient is φ = 1259554230792.

The previous prime is 1889368458827. The next prime is 1889368458863. The reversal of 1889368458849 is 9488548639881.

The square root of 1889368458849 is 1374543.

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

1889368458849 is a `hidden beast` number, since 1 + 8 + 89 + 3 + 6 + 8 + 458 + 84 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 520047226449 + 1369321232400 = 721143^2 + 1170180^2 .

It is not a de Polignac number, because 1889368458849 - 2¹³ = 1889368450657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1889368458349) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 37087207 + ... + 37138115.

Almost surely, 2^{1889368458849} is an apocalyptic number.

1889368458849 is the 1374543-rd square number.

1889368458849 is the 687272-nd centered octagonal number.

It is an amenable number.

1889368458849 is a deficient number, since it is larger than the sum of its proper divisors (943444010914).

1889368458849 is an frugal number, since it uses more digits than its factorization.

1889368458849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101836 (or 50912 counting only the distinct ones).

The product of its digits is 3822059520, while the sum is 81.

Multiplying 1889368458849 by its sum of digits (81), we get a square (153038845166769 = 12370887²).

1889368458849 divided by its sum of digits (81) gives a square (23325536529 = 152727²).

The spelling of 1889368458849 in words is "one trillion, eight hundred eighty-nine billion, three hundred sixty-eight million, four hundred fifty-eight thousand, eight hundred forty-nine".