1986965 has 8 divisors (see below), whose sum is σ = 2395008. Its totient is φ = 1582480.

The previous prime is 1986949. The next prime is 1986967. The reversal of 1986965 is 5696891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1986965 - 2⁴ = 1986949 is a prime.

It is a super-2 number, since 2×1986965² = 7896059822450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (299376).

2^1986965 is an apocalyptic number.

It is an amenable number.

1986965 is a deficient number, since it is larger than the sum of its proper divisors (408043).

1986965 is a wasteful number, since it uses less digits than its factorization.

1986965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779.

The product of its digits is 116640, while the sum is 44.

The square root of 1986965 is about 1409.5974602701. The cubic root of 1986965 is about 125.7177903268.

The spelling of 1986965 in words is "one million, nine hundred eighty-six thousand, nine hundred sixty-five".