1989679 has 2 divisors, whose sum is σ = 1989680. Its totient is φ = 1989678.

The previous prime is 1989671. The next prime is 1989683. The reversal of 1989679 is 9769891.

It is a strong prime.

It is an emirp because it is prime and its reverse (9769891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989679 - 2³ = 1989671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994839 + 994840.

It is an arithmetic number, because the mean of its divisors is an integer number (994840).

2^1989679 is an apocalyptic number.

1989679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989679 is an equidigital number, since it uses as much as digits as its factorization.

1989679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 49.

The square root of 1989679 is about 1410.5598179446. The cubic root of 1989679 is about 125.7750036904.

It can be divided in two parts, 1989 and 679, that multiplied together give a palindrome (1350531).

The spelling of 1989679 in words is "one million, nine hundred eighty-nine thousand, six hundred seventy-nine".