1965987 has 12 divisors (see below), whose sum is σ = 2989480. Its totient is φ = 1241568.

The previous prime is 1965983. The next prime is 1966007. The reversal of 1965987 is 7895691.

It is not a de Polignac number, because 1965987 - 2² = 1965983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1965983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5578 + ... + 5919.

2^1965987 is an apocalyptic number.

1965987 is a deficient number, since it is larger than the sum of its proper divisors (1023493).

1965987 is a wasteful number, since it uses less digits than its factorization.

1965987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11522 (or 11519 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 1965987 is about 1402.1365839318. The cubic root of 1965987 is about 125.2737892112.

The spelling of 1965987 in words is "one million, nine hundred sixty-five thousand, nine hundred eighty-seven".