1965287 has 4 divisors (see below), whose sum is σ = 1968096. Its totient is φ = 1962480.

The previous prime is 1965277. The next prime is 1965289. The reversal of 1965287 is 7825691.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7825691 = 71 ⋅110221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965287 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1965287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965289) 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, 587 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (492024).

2^1965287 is an apocalyptic number.

1965287 is a deficient number, since it is larger than the sum of its proper divisors (2809).

1965287 is a wasteful number, since it uses less digits than its factorization.

1965287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808.

The product of its digits is 30240, while the sum is 38.

The square root of 1965287 is about 1401.8869426598. The cubic root of 1965287 is about 125.2589193160.

The spelling of 1965287 in words is "one million, nine hundred sixty-five thousand, two hundred eighty-seven".