1979217 has 12 divisors (see below), whose sum is σ = 2920320. Its totient is φ = 1291128.

The previous prime is 1979209. The next prime is 1979227. The reversal of 1979217 is 7129791.

It is not a de Polignac number, because 1979217 - 2³ = 1979209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979207) 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 11 ways as a sum of consecutive naturals, for example, 1917 + ... + 2762.

It is an arithmetic number, because the mean of its divisors is an integer number (243360).

2^1979217 is an apocalyptic number.

It is an amenable number.

1979217 is a deficient number, since it is larger than the sum of its proper divisors (941103).

1979217 is a wasteful number, since it uses less digits than its factorization.

1979217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4732 (or 4729 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1979217 is about 1406.8464735002. The cubic root of 1979217 is about 125.5541688775.

The spelling of 1979217 in words is "one million, nine hundred seventy-nine thousand, two hundred seventeen".