1220015 has 4 divisors (see below), whose sum is σ = 1464024. Its totient is φ = 976008.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1220015 is 5100221.

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 1220015 - 2⁶ = 1219951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1219978 and 1220005.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 121997 + ... + 122006.

It is an arithmetic number, because the mean of its divisors is an integer number (366006).

2^1220015 is an apocalyptic number.

1220015 is a deficient number, since it is larger than the sum of its proper divisors (244009).

1220015 is an equidigital number, since it uses as much as digits as its factorization.

1220015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244008.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 1220015 is about 1104.5428918788. The cubic root of 1220015 is about 106.8534109351.

Adding to 1220015 its reverse (5100221), we get a palindrome (6320236).

The spelling of 1220015 in words is "one million, two hundred twenty thousand, fifteen".