1684527849 has 9 divisors (see below), whose sum is σ = 2433384759. Its totient is φ = 1122936480.

The previous prime is 1684527829. The next prime is 1684527851. The reversal of 1684527849 is 9487254861.

It is a happy number.

The square root of 1684527849 is 41043.

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., 1575534249 + 108993600 = 39693^2 + 10440^2 .

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

It is not a de Polignac number, because 1684527849 - 2⁷ = 1684527721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1684527795 and 1684527804.

It is not an unprimeable number, because it can be changed into a prime (1684527829) 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, 116289 + ... + 129969.

Almost surely, 2^1684527849 is an apocalyptic number.

1684527849 is the 41043-rd square number.

1684527849 is the 20522-nd centered octagonal number.

It is an amenable number.

1684527849 is a deficient number, since it is larger than the sum of its proper divisors (748856910).

1684527849 is an frugal number, since it uses more digits than its factorization.

1684527849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27368 (or 13684 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The cubic root of 1684527849 is about 1189.8514159046.

The spelling of 1684527849 in words is "one billion, six hundred eighty-four million, five hundred twenty-seven thousand, eight hundred forty-nine".