1979205 has 8 divisors (see below), whose sum is σ = 3166752. Its totient is φ = 1055568.

The previous prime is 1979189. The next prime is 1979207. The reversal of 1979205 is 5029791.

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

It is not a de Polignac number, because 1979205 - 2⁴ = 1979189 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

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 7 ways as a sum of consecutive naturals, for example, 65959 + ... + 65988.

It is an arithmetic number, because the mean of its divisors is an integer number (395844).

2^1979205 is an apocalyptic number.

1979205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1979205 is a deficient number, since it is larger than the sum of its proper divisors (1187547).

1979205 is a wasteful number, since it uses less digits than its factorization.

1979205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131955.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 1979205 is about 1406.8422086361. The cubic root of 1979205 is about 125.5539151319.

The spelling of 1979205 in words is "one million, nine hundred seventy-nine thousand, two hundred five".