1705742421 has 4 divisors (see below), whose sum is σ = 2274323232. Its totient is φ = 1137161612.

The previous prime is 1705742359. The next prime is 1705742473. The reversal of 1705742421 is 1242475071.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1705742421 - 2⁷ = 1705742293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1705742221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284290401 + ... + 284290406.

It is an arithmetic number, because the mean of its divisors is an integer number (568580808).

Almost surely, 2^1705742421 is an apocalyptic number.

It is an amenable number.

1705742421 is a deficient number, since it is larger than the sum of its proper divisors (568580811).

1705742421 is an equidigital number, since it uses as much as digits as its factorization.

1705742421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568580810.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 1705742421 is about 41300.6346319279. The cubic root of 1705742421 is about 1194.8255018513.

The spelling of 1705742421 in words is "one billion, seven hundred five million, seven hundred forty-two thousand, four hundred twenty-one".