1229979 has 4 divisors (see below), whose sum is σ = 1639976. Its totient is φ = 819984.

The previous prime is 1229957. The next prime is 1229981. The reversal of 1229979 is 9799221.

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: 9799221 = 3 ⋅3266407.

It is not a de Polignac number, because 1229979 - 2¹² = 1225883 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1229939) 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, 204994 + ... + 204999.

It is an arithmetic number, because the mean of its divisors is an integer number (409994).

2^1229979 is an apocalyptic number.

1229979 is a deficient number, since it is larger than the sum of its proper divisors (409997).

1229979 is an equidigital number, since it uses as much as digits as its factorization.

1229979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409996.

The product of its digits is 20412, while the sum is 39.

The square root of 1229979 is about 1109.0441830694. The cubic root of 1229979 is about 107.1435172023.

It can be divided in two parts, 122 and 9979, that added together give a palindrome (10101).

The spelling of 1229979 in words is "one million, two hundred twenty-nine thousand, nine hundred seventy-nine".