1985669 has 8 divisors (see below), whose sum is σ = 2278848. Its totient is φ = 1694880.

The previous prime is 1985663. The next prime is 1985677. The reversal of 1985669 is 9665891.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985669 is a prime.

It is a super-2 number, since 2×1985669² = 7885762755122, 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 (1985663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1889 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (284856).

2^1985669 is an apocalyptic number.

It is an amenable number.

1985669 is a deficient number, since it is larger than the sum of its proper divisors (293179).

1985669 is an equidigital number, since it uses as much as digits as its factorization.

1985669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195.

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

The square root of 1985669 is about 1409.1376795757. The cubic root of 1985669 is about 125.6904511952.

The spelling of 1985669 in words is "one million, nine hundred eighty-five thousand, six hundred sixty-nine".