1220819 has 2 divisors, whose sum is σ = 1220820. Its totient is φ = 1220818.

The previous prime is 1220803. The next prime is 1220833. The reversal of 1220819 is 9180221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220819 - 2⁴ = 1220803 is a prime.

It is a super-2 number, since 2×1220819² = 2980798061522, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p₉₄₄₀₆ and since 1220819 and 94406 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220794 and 1220803.

It is not a weakly prime, because it can be changed into another prime (1220839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610409 + 610410.

It is an arithmetic number, because the mean of its divisors is an integer number (610410).

2^1220819 is an apocalyptic number.

1220819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220819 is an equidigital number, since it uses as much as digits as its factorization.

1220819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1220819 is about 1104.9067833985. The cubic root of 1220819 is about 106.8768782087.

The spelling of 1220819 in words is "one million, two hundred twenty thousand, eight hundred nineteen".