1299979 has 2 divisors, whose sum is σ = 1299980. Its totient is φ = 1299978.

The previous prime is 1299953. The next prime is 1299989. The reversal of 1299979 is 9799921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1299979 is a prime.

1299979 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1299919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649989 + 649990.

It is an arithmetic number, because the mean of its divisors is an integer number (649990).

2^1299979 is an apocalyptic number.

1299979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299979 is an equidigital number, since it uses as much as digits as its factorization.

1299979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 46.

The square root of 1299979 is about 1140.1662159527. The cubic root of 1299979 is about 109.1387006299.

It can be divided in two parts, 1299 and 979, that multiplied together give a palindrome (1271721).

The spelling of 1299979 in words is "one million, two hundred ninety-nine thousand, nine hundred seventy-nine".