1965881 has 4 divisors (see below), whose sum is σ = 2033700. Its totient is φ = 1898064.

The previous prime is 1965853. The next prime is 1965883. The reversal of 1965881 is 1885691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1885691 = 17 ⋅110923.

It can be written as a sum of positive squares in 2 ways, for example, as 1488400 + 477481 = 1220^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1965881 - 2¹⁰ = 1964857 is a prime.

It is a super-2 number, since 2×1965881² = 7729376212322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1965883) 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, 33866 + ... + 33923.

It is an arithmetic number, because the mean of its divisors is an integer number (508425).

2^1965881 is an apocalyptic number.

It is an amenable number.

1965881 is a deficient number, since it is larger than the sum of its proper divisors (67819).

1965881 is an equidigital number, since it uses as much as digits as its factorization.

1965881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67818.

The product of its digits is 17280, while the sum is 38.

The square root of 1965881 is about 1402.0987839664. The cubic root of 1965881 is about 125.2715377111.

The spelling of 1965881 in words is "one million, nine hundred sixty-five thousand, eight hundred eighty-one".