1961905 has 8 divisors (see below), whose sum is σ = 2568384. Its totient is φ = 1426800.

The previous prime is 1961903. The next prime is 1961909. The reversal of 1961905 is 5091691.

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

It is not a de Polignac number, because 1961905 - 2¹ = 1961903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17781 + ... + 17890.

It is an arithmetic number, because the mean of its divisors is an integer number (321048).

2^1961905 is an apocalyptic number.

It is an amenable number.

1961905 is a deficient number, since it is larger than the sum of its proper divisors (606479).

1961905 is a wasteful number, since it uses less digits than its factorization.

1961905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35687.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1961905 is about 1400.6801919068. The cubic root of 1961905 is about 125.1870266952.

The spelling of 1961905 in words is "one million, nine hundred sixty-one thousand, nine hundred five".