1220465 has 16 divisors (see below), whose sum is σ = 1598400. Its totient is φ = 891072.

The previous prime is 1220437. The next prime is 1220489. The reversal of 1220465 is 5640221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1220465 - 2²⁰ = 171889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2534 + ... + 2976.

It is an arithmetic number, because the mean of its divisors is an integer number (99900).

2^1220465 is an apocalyptic number.

It is an amenable number.

1220465 is a deficient number, since it is larger than the sum of its proper divisors (377935).

1220465 is a wasteful number, since it uses less digits than its factorization.

1220465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1220465 is about 1104.7465772746. The cubic root of 1220465 is about 106.8665468731.

Adding to 1220465 its reverse (5640221), we get a palindrome (6860686).

The spelling of 1220465 in words is "one million, two hundred twenty thousand, four hundred sixty-five".