1705742409 has 16 divisors (see below), whose sum is σ = 2605271040. Its totient is φ = 972443280.

The previous prime is 1705742359. The next prime is 1705742473. The reversal of 1705742409 is 9042475071.

It is not a de Polignac number, because 1705742409 - 2¹⁹ = 1705218121 is a prime.

It is a super-2 number, since 2×1705742409² = 5819114331722246562, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1705742609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85179 + ... + 103280.

It is an arithmetic number, because the mean of its divisors is an integer number (162829440).

Almost surely, 2^1705742409 is an apocalyptic number.

It is an amenable number.

1705742409 is a deficient number, since it is larger than the sum of its proper divisors (899528631).

1705742409 is a wasteful number, since it uses less digits than its factorization.

1705742409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188900.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 1705742409 is about 41300.6344866517. The cubic root of 1705742409 is about 1194.8254990494.

The spelling of 1705742409 in words is "one billion, seven hundred five million, seven hundred forty-two thousand, four hundred nine".