1784797137369 has 9 divisors (see below), whose sum is σ = 2578046098719. Its totient is φ = 1189862086320.

The previous prime is 1784797137337. The next prime is 1784797137371. The reversal of 1784797137369 is 9637317974871.

The square root of 1784797137369 is 1335963.

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

1784797137369 is a `hidden beast` number, since 1 + 7 + 8 + 47 + 97 + 137 + 369 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1258069559769 + 526727577600 = 1121637^2 + 725760^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1784797137369 - 2⁵ = 1784797137337 is a prime.

It is a super-2 number, since 2×1784797137369² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1784797137297 and 1784797137306.

It is not an unprimeable number, because it can be changed into a prime (1784797133369) 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, 3785229 + ... + 4230549.

Almost surely, 2^{1784797137369} is an apocalyptic number.

1784797137369 is the 1335963-rd square number.

1784797137369 is the 667982-nd centered octagonal number.

It is an amenable number.

1784797137369 is a deficient number, since it is larger than the sum of its proper divisors (793248961350).

1784797137369 is an frugal number, since it uses more digits than its factorization.

1784797137369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890648 (or 445324 counting only the distinct ones).

The product of its digits is 336063168, while the sum is 72.

The spelling of 1784797137369 in words is "one trillion, seven hundred eighty-four billion, seven hundred ninety-seven million, one hundred thirty-seven thousand, three hundred sixty-nine".