1979489 has 2 divisors, whose sum is σ = 1979490. Its totient is φ = 1979488.

The previous prime is 1979473. The next prime is 1979491. The reversal of 1979489 is 9849791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 478864 = 1225^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 1979489 - 2⁴ = 1979473 is a prime.

It is a super-2 number, since 2×1979489² = 7836753402242, which contains 22 as substring.

Together with 1979491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1979189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989744 + 989745.

It is an arithmetic number, because the mean of its divisors is an integer number (989745).

2^1979489 is an apocalyptic number.

It is an amenable number.

1979489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979489 is an equidigital number, since it uses as much as digits as its factorization.

1979489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 1979489 is about 1406.9431402868. The cubic root of 1979489 is about 125.5599201703.

The spelling of 1979489 in words is "one million, nine hundred seventy-nine thousand, four hundred eighty-nine".