1689398529 has 48 divisors (see below), whose sum is σ = 2839092480. Its totient is φ = 890940960.

The previous prime is 1689398467. The next prime is 1689398533. The reversal of 1689398529 is 9258939861.

It is a happy number.

It is not a de Polignac number, because 1689398529 - 2⁹ = 1689398017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1689398569) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 320344 + ... + 325574.

It is an arithmetic number, because the mean of its divisors is an integer number (59147760).

Almost surely, 2^1689398529 is an apocalyptic number.

It is an amenable number.

1689398529 is a deficient number, since it is larger than the sum of its proper divisors (1149693951).

1689398529 is an equidigital number, since it uses as much as digits as its factorization.

1689398529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287 (or 5254 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 60.

The square root of 1689398529 is about 41102.2934761553. The cubic root of 1689398529 is about 1190.9970997074.

It can be divided in two parts, 168939852 and 9, that added together give a palindrome (168939861).

The spelling of 1689398529 in words is "one billion, six hundred eighty-nine million, three hundred ninety-eight thousand, five hundred twenty-nine".