1979365 has 4 divisors (see below), whose sum is σ = 2375244.
Its totient is φ = 1583488.
The previous prime is 1979359. The next prime is 1979371. The reversal of 1979365 is 5639791.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5639791 = 347 ⋅16253.
It is an interprime number because it is at equal distance from previous prime (1979359) and next prime (1979371).
It can be written as a sum of positive squares in 2 ways, for example, as 1340964 + 638401 = 1158^2 + 799^2
It is a cyclic number.
It is not a de Polignac number, because 1979365 - 29 = 1978853 is a prime.
It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197932 + ... + 197941.
It is an arithmetic number, because the mean of its divisors is an integer number (593811).
21979365 is an apocalyptic number.
It is an amenable number.
1979365 is a deficient number, since it is larger than the sum of its proper divisors (395879).
1979365 is an equidigital number, since it uses as much as digits as its factorization.
1979365 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 395878.
The product of its digits is 51030, while the sum is 40.
The square root of 1979365 is about 1406.8990724284.
The cubic root of 1979365 is about 125.5572983228.
The spelling of 1979365 in words is "one million, nine hundred seventy-nine thousand, three hundred sixty-five".