1689473409 has 16 divisors (see below), whose sum is σ = 2427177984. Its totient is φ = 1039132800.

The previous prime is 1689473399. The next prime is 1689473411. The reversal of 1689473409 is 9043749861.

It is not a de Polignac number, because 1689473409 - 2⁴ = 1689473393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1689473449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72069 + ... + 92589.

It is an arithmetic number, because the mean of its divisors is an integer number (151698624).

Almost surely, 2^1689473409 is an apocalyptic number.

It is an amenable number.

1689473409 is a deficient number, since it is larger than the sum of its proper divisors (737704575).

1689473409 is a wasteful number, since it uses less digits than its factorization.

1689473409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22648.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The square root of 1689473409 is about 41103.2043641369. The cubic root of 1689473409 is about 1191.0146958209.

The spelling of 1689473409 in words is "one billion, six hundred eighty-nine million, four hundred seventy-three thousand, four hundred nine".