1689180740 has 24 divisors (see below), whose sum is σ = 3820147800. Its totient is φ = 623697408.

The previous prime is 1689180737. The next prime is 1689180749. The reversal of 1689180740 is 470819861.

It can be written as a sum of positive squares in 4 ways, for example, as 4734976 + 1684445764 = 2176^2 + 41042^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1689180691 and 1689180700.

It is not an unprimeable number, because it can be changed into a prime (1689180749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3248165 + ... + 3248684.

It is an arithmetic number, because the mean of its divisors is an integer number (159172825).

Almost surely, 2^1689180740 is an apocalyptic number.

1689180740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1689180740 is an abundant number, since it is smaller than the sum of its proper divisors (2130967060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1689180740 is a wasteful number, since it uses less digits than its factorization.

1689180740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6496871 (or 6496869 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 1689180740 is about 41099.6440373880. The cubic root of 1689180740 is about 1190.9459183332.

The spelling of 1689180740 in words is "one billion, six hundred eighty-nine million, one hundred eighty thousand, seven hundred forty".