1686498489 has 55 divisors (see below), whose sum is σ = 2740537193. Its totient is φ = 1037845224.

The previous prime is 1686498449. The next prime is 1686498491. The reversal of 1686498489 is 9848946861.

The square root of 1686498489 is 41067.

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

1686498489 is a `hidden beast` number, since 1 + 6 + 8 + 64 + 98 + 489 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 836192889 + 850305600 = 28917^2 + 29160^2 .

It is not a de Polignac number, because 1686498489 - 2¹³ = 1686490297 is a prime.

It is a Duffinian number.

Its product of digits (23887872) is a multiple of the sum of its prime divisors (16).

It is not an unprimeable number, because it can be changed into a prime (1686498409) by changing a digit.

It is a polite number, since it can be written in 54 ways as a sum of consecutive naturals, for example, 129730647 + ... + 129730659.

Almost surely, 2^1686498489 is an apocalyptic number.

1686498489 is the 41067-th square number.

1686498489 is the 20534-th centered octagonal number.

It is an amenable number.

1686498489 is a deficient number, since it is larger than the sum of its proper divisors (1054038704).

1686498489 is an frugal number, since it uses more digits than its factorization.

1686498489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 16 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 63.

The cubic root of 1686498489 is about 1190.3152164980.

The spelling of 1686498489 in words is "one billion, six hundred eighty-six million, four hundred ninety-eight thousand, four hundred eighty-nine".