1963987 has 4 divisors (see below), whose sum is σ = 1976200. Its totient is φ = 1951776.

The previous prime is 1963981. The next prime is 1963999. The reversal of 1963987 is 7893691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1963987 - 2¹⁹ = 1439699 is a prime.

It is a Duffinian number.

1963987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1963981) 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, 5862 + ... + 6187.

It is an arithmetic number, because the mean of its divisors is an integer number (494050).

2^1963987 is an apocalyptic number.

1963987 is a deficient number, since it is larger than the sum of its proper divisors (12213).

1963987 is a wasteful number, since it uses less digits than its factorization.

1963987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12212.

The product of its digits is 81648, while the sum is 43.

The square root of 1963987 is about 1401.4232051739. The cubic root of 1963987 is about 125.2312944258.

The spelling of 1963987 in words is "one million, nine hundred sixty-three thousand, nine hundred eighty-seven".