1965979 has 2 divisors, whose sum is σ = 1965980. Its totient is φ = 1965978.

The previous prime is 1965973. The next prime is 1965983. The reversal of 1965979 is 9795691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1965979 - 2⁷ = 1965851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1965973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982989 + 982990.

It is an arithmetic number, because the mean of its divisors is an integer number (982990).

2^1965979 is an apocalyptic number.

1965979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965979 is an equidigital number, since it uses as much as digits as its factorization.

1965979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 46.

The square root of 1965979 is about 1402.1337311398. The cubic root of 1965979 is about 125.2736192895.

The spelling of 1965979 in words is "one million, nine hundred sixty-five thousand, nine hundred seventy-nine".