1975979 has 4 divisors (see below), whose sum is σ = 2021976. Its totient is φ = 1929984.

The previous prime is 1975957. The next prime is 1975991. The reversal of 1975979 is 9795791.

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: 9795791 = 17 ⋅576223.

It is a cyclic number.

It is not a de Polignac number, because 1975979 - 2²⁰ = 927403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1975949) 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, 22934 + ... + 23019.

It is an arithmetic number, because the mean of its divisors is an integer number (505494).

2^1975979 is an apocalyptic number.

1975979 is a deficient number, since it is larger than the sum of its proper divisors (45997).

1975979 is an equidigital number, since it uses as much as digits as its factorization.

1975979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45996.

The product of its digits is 178605, while the sum is 47.

The square root of 1975979 is about 1405.6952016707. The cubic root of 1975979 is about 125.4856626108.

The spelling of 1975979 in words is "one million, nine hundred seventy-five thousand, nine hundred seventy-nine".