1213879 has 2 divisors, whose sum is σ = 1213880. Its totient is φ = 1213878.

The previous prime is 1213873. The next prime is 1213897. The reversal of 1213879 is 9783121.

Together with next prime (1213897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213879 - 2⁹ = 1213367 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213873) 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, 606939 + 606940.

It is an arithmetic number, because the mean of its divisors is an integer number (606940).

2^1213879 is an apocalyptic number.

1213879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213879 is an equidigital number, since it uses as much as digits as its factorization.

1213879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1213879 is about 1101.7617709832. The cubic root of 1213879 is about 106.6739719389.

The spelling of 1213879 in words is "one million, two hundred thirteen thousand, eight hundred seventy-nine".