1985679 has 24 divisors (see below), whose sum is σ = 3023280. Its totient is φ = 1254528.

The previous prime is 1985677. The next prime is 1985689. The reversal of 1985679 is 9765891.

It is not a de Polignac number, because 1985679 - 2¹ = 1985677 is a prime.

1985679 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22267 + ... + 22355.

It is an arithmetic number, because the mean of its divisors is an integer number (125970).

2^1985679 is an apocalyptic number.

1985679 is a deficient number, since it is larger than the sum of its proper divisors (1037601).

1985679 is a wasteful number, since it uses less digits than its factorization.

1985679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 196 counting only the distinct ones).

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

The square root of 1985679 is about 1409.1412278406. The cubic root of 1985679 is about 125.6906621908.

The spelling of 1985679 in words is "one million, nine hundred eighty-five thousand, six hundred seventy-nine".