1986969 has 4 divisors (see below), whose sum is σ = 2649296. Its totient is φ = 1324644.

The previous prime is 1986967. The next prime is 1986989. The reversal of 1986969 is 9696891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9696891 = 3 ⋅3232297.

It is not a de Polignac number, because 1986969 - 2¹ = 1986967 is a prime.

It is a super-2 number, since 2×1986969² = 7896091613922, which contains 22 as substring.

It is a D-number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 331159 + ... + 331164.

It is an arithmetic number, because the mean of its divisors is an integer number (662324).

2^1986969 is an apocalyptic number.

It is an amenable number.

1986969 is a deficient number, since it is larger than the sum of its proper divisors (662327).

1986969 is an equidigital number, since it uses as much as digits as its factorization.

1986969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662326.

The product of its digits is 209952, while the sum is 48.

The square root of 1986969 is about 1409.5988791142. The cubic root of 1986969 is about 125.7178746885.

The spelling of 1986969 in words is "one million, nine hundred eighty-six thousand, nine hundred sixty-nine".