1985279 has 2 divisors, whose sum is σ = 1985280. Its totient is φ = 1985278.

The previous prime is 1985257. The next prime is 1985287. The reversal of 1985279 is 9725891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985279 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 9² + 8³ + 5⁹ + 2¹³ + 7⁵ + 9⁴ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992639 + 992640.

It is an arithmetic number, because the mean of its divisors is an integer number (992640).

2^1985279 is an apocalyptic number.

1985279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985279 is an equidigital number, since it uses as much as digits as its factorization.

1985279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 41.

The square root of 1985279 is about 1408.9992902766. Note that the first 3 decimals coincide. The cubic root of 1985279 is about 125.6822218133.

The spelling of 1985279 in words is "one million, nine hundred eighty-five thousand, two hundred seventy-nine".