1971705 has 8 divisors (see below), whose sum is σ = 3154752. Its totient is φ = 1051568.

The previous prime is 1971691. The next prime is 1971707. The reversal of 1971705 is 5071791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1971705 - 2⁷ = 1971577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1971707) 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 7 ways as a sum of consecutive naturals, for example, 65709 + ... + 65738.

It is an arithmetic number, because the mean of its divisors is an integer number (394344).

2^1971705 is an apocalyptic number.

1971705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1971705 is a deficient number, since it is larger than the sum of its proper divisors (1183047).

1971705 is a wasteful number, since it uses less digits than its factorization.

1971705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131455.

The product of its (nonzero) digits is 2205, while the sum is 30.

The square root of 1971705 is about 1404.1741345004. The cubic root of 1971705 is about 125.3951230396.

The spelling of 1971705 in words is "one million, nine hundred seventy-one thousand, seven hundred five".