1213979 has 4 divisors (see below), whose sum is σ = 1307376. Its totient is φ = 1120584.

The previous prime is 1213951. The next prime is 1213981. The reversal of 1213979 is 9793121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213979 - 2¹² = 1209883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213909) 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, 46679 + ... + 46704.

It is an arithmetic number, because the mean of its divisors is an integer number (326844).

2^1213979 is an apocalyptic number.

1213979 is a deficient number, since it is larger than the sum of its proper divisors (93397).

1213979 is an equidigital number, since it uses as much as digits as its factorization.

1213979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93396.

The product of its digits is 3402, while the sum is 32.

The square root of 1213979 is about 1101.8071519100. The cubic root of 1213979 is about 106.6769011447.

The spelling of 1213979 in words is "one million, two hundred thirteen thousand, nine hundred seventy-nine".