1979797 has 4 divisors (see below), whose sum is σ = 1983520. Its totient is φ = 1976076.

The previous prime is 1979779. The next prime is 1979807. The reversal of 1979797 is 7979791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1979797 - 2¹¹ = 1977749 is a prime.

It is a super-2 number, since 2×1979797² = 7839192322418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1979797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979717) 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, 897 + ... + 2182.

It is an arithmetic number, because the mean of its divisors is an integer number (495880).

2^1979797 is an apocalyptic number.

It is an amenable number.

1979797 is a deficient number, since it is larger than the sum of its proper divisors (3723).

1979797 is an equidigital number, since it uses as much as digits as its factorization.

1979797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722.

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

The square root of 1979797 is about 1407.0525931890. The cubic root of 1979797 is about 125.5664320277.

The spelling of 1979797 in words is "one million, nine hundred seventy-nine thousand, seven hundred ninety-seven".