1797979 has 4 divisors (see below), whose sum is σ = 1876176. Its totient is φ = 1719784.

The previous prime is 1797967. The next prime is 1798001. The reversal of 1797979 is 9797971.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9797971 = 139 ⋅70489.

It is a cyclic number.

It is not a de Polignac number, because 1797979 - 2⁵ = 1797947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1797379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39064 + ... + 39109.

It is an arithmetic number, because the mean of its divisors is an integer number (469044).

2^1797979 is an apocalyptic number.

1797979 is a deficient number, since it is larger than the sum of its proper divisors (78197).

1797979 is an equidigital number, since it uses as much as digits as its factorization.

1797979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78196.

The product of its digits is 250047, while the sum is 49.

The square root of 1797979 is about 1340.8873927366. The cubic root of 1797979 is about 121.5984964539.

It can be divided in two parts, 179 and 7979, that multiplied together give a palindrome (1428241).

The spelling of 1797979 in words is "one million, seven hundred ninety-seven thousand, nine hundred seventy-nine".