1961985 has 16 divisors (see below), whose sum is σ = 3165120. Its totient is φ = 1037760.

The previous prime is 1961983. The next prime is 1961989. The reversal of 1961985 is 5891691.

It is not a de Polignac number, because 1961985 - 2¹ = 1961983 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1961983) 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, 1615 + ... + 2555.

It is an arithmetic number, because the mean of its divisors is an integer number (197820).

It is a Proth number, since it is equal to 479 ⋅ 2¹² + 1 and 479 < 2¹².

2^1961985 is an apocalyptic number.

1961985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1961985 is a deficient number, since it is larger than the sum of its proper divisors (1203135).

1961985 is a wasteful number, since it uses less digits than its factorization.

1961985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088.

The product of its digits is 19440, while the sum is 39.

The square root of 1961985 is about 1400.7087491695. The cubic root of 1961985 is about 125.1887282431.

The spelling of 1961985 in words is "one million, nine hundred sixty-one thousand, nine hundred eighty-five".