1961705 has 16 divisors (see below), whose sum is σ = 2479680. Its totient is φ = 1487808.

The previous prime is 1961683. The next prime is 1961737. The reversal of 1961705 is 5071691.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961705 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11954 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (154980).

2^1961705 is an apocalyptic number.

It is an amenable number.

1961705 is a deficient number, since it is larger than the sum of its proper divisors (517975).

1961705 is a wasteful number, since it uses less digits than its factorization.

1961705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 1961705 is about 1400.6087962026. The cubic root of 1961705 is about 125.1827726231.

The spelling of 1961705 in words is "one million, nine hundred sixty-one thousand, seven hundred five".