1220013 has 12 divisors (see below), whose sum is σ = 1772160. Its totient is φ = 808776.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1220013 is 3100221.

It is a happy number.

It is not a de Polignac number, because 1220013 - 2⁶ = 1219949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1219977 and 1220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2308 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (147680).

2^1220013 is an apocalyptic number.

It is an amenable number.

1220013 is a deficient number, since it is larger than the sum of its proper divisors (552147).

1220013 is a wasteful number, since it uses less digits than its factorization.

1220013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1220013 is about 1104.5419865265. The cubic root of 1220013 is about 106.8533525460.

Adding to 1220013 its reverse (3100221), we get a palindrome (4320234).

The spelling of 1220013 in words is "one million, two hundred twenty thousand, thirteen".